LIGHT SLEEP • NOISE • AWAKENINGS

Light sleep: why do I wake up at every little noise?

Published August 20, 2026 • Evidence-based guide • Sleeple

“I sleep with one eye open” is a common description of this problem. A door closes, a neighbor walks upstairs, a car passes outside or a partner’s phone vibrates and you become instantly aware of it. It is tempting to conclude that your brain never reaches deep sleep. That conclusion is often too simple.

Normal sleep is not complete sensory shutdown. The brain reduces its response to the outside world, but it retains a surveillance function. Some sounds are filtered without conscious awakening, some produce an electrical response in the sleeping brain, and others trigger a micro-arousal or wake you fully. The useful question is therefore not simply “am I in light sleep?” but why is my arousal threshold low enough for ordinary sounds to interrupt the night repeatedly?

1. What does “light sleep” actually mean?

Clinical sleep scoring divides non-REM sleep into stages N1, N2 and N3. N1 is a transition from wakefulness into sleep. N2 is a more stable sleep stage and normally occupies a large part of an adult night. N3 is slow-wave or deep sleep. REM sleep is a separate physiological state with characteristic brain activity, eye movements and muscle atonia.

In everyday language, people often group N1 and N2 under the label “light sleep.” That wording can be misleading because N2 is not poor-quality or incomplete sleep. It is a normal and important stage. Sleep spindles and K-complexes occur during N2 and are involved in sensory gating and memory-related processes.

A typical night therefore contains a substantial amount of N2. Seeing a high “light sleep” percentage on a watch does not automatically indicate a problem. Consumer wearables estimate sleep stages from movement, heart rate and other indirect signals; they do not record brain electrical activity in the way clinical polysomnography does.

If your tracker says that 60% of the night was light sleep, do not treat that number as a diagnosis. Ask first whether your sleep is actually fragmented and whether your daytime function is impaired.

2. Why can the sleeping brain still hear?

Sleep changes sensory processing instead of switching it off. Sounds continue to reach the auditory system, and the brain evaluates them at several levels. From a survival perspective, this is useful: a sleeper benefits from ignoring harmless repetitive background noise but still needs some capacity to respond to an unusual threat, a crying child, an alarm or an unfamiliar voice.

The brain does not respond only to absolute volume. Suddenness, unpredictability and context matter. A steady fan may become easy to ignore, while an irregular impact sound at a similar average level can repeatedly attract processing.

Work on K-complexes illustrates this intermediate processing. A 2021 laboratory study exposed sleeping adults to controlled road-traffic and wind-farm sounds. K-complex responses increased at levels below those that reliably increased scored EEG arousals or full awakenings. The sleeping brain was responding to the sound before conscious awakening became obvious.

Sleep is therefore not a binary state of “hearing nothing” versus “awake.” Several levels of response occur in between.

3. Is a micro-arousal the same as waking up?

No. In polysomnography, a cortical arousal is a brief change in EEG activity that meets standardized scoring criteria. It can last only seconds and may never enter memory. A full awakening is more sustained and more likely to be remembered.

This explains how sleep can be fragmented without someone recalling dozens of awakenings. Obstructive sleep apnea, periodic limb movements and environmental noise can produce repeated arousals that affect continuity even when morning memory of them is poor.

The opposite is also possible. Some people become very aware of brief normal transitions between sleep cycles and remember several short periods of wakefulness. They may feel they were “awake all night” even when objective total wake time was limited.

Subjective sleep experience and objective measurement overlap but are not identical.

4. Does environmental noise really disrupt sleep?

Yes. The evidence is strongest for road, rail and aircraft traffic. A systematic review prepared for the World Health Organization’s environmental-noise guidelines found exposure-response relationships between nighttime transportation noise and reported sleep disturbance. An updated review and meta-analysis published in 2022 added large datasets and again found that greater nighttime traffic noise was associated with greater sleep disturbance.

A 2026 systematic review and meta-analysis of 68 observational studies similarly concluded that environmental noise, particularly transportation noise, is associated with a higher risk of sleep disturbance. Effect sizes varied according to source, population, design and the way sleep disturbance was measured.

Laboratory research provides biological plausibility. When sleepers are exposed to controlled intermittent noise, researchers can observe more brain responses, awakenings and changes in sleep architecture. Simulated hospital-noise experiments have increased awakenings and reduced sleep efficiency.

That does not mean one passing car ruins an entire night. The effect depends on intensity, repetition, timing, sound characteristics and individual vulnerability.

5. Why are some people much more noise-sensitive than others?

Individual variability is substantial. Two people can share the same bedroom and report very different nights. One sleeps through a busy street; the other wakes to every scooter or footstep.

Potential contributors include:

• trait-like sensitivity to noise;
• age;
• hearing acuity;
• sleep stage at the moment of exposure;
• stress and hypervigilance;
• pre-existing sleep fragmentation;
• familiarity with the environment;
• predictability of the sound;
• emotional meaning attached to it.

Older research already found different responses among people who described themselves as highly or minimally sensitive to noise. More recent work on K-complexes suggests that individual sensory characteristics also influence how the sleeping brain reacts.

There is little value in judging yourself because a partner “can sleep through anything.” Noise tolerance is not a test of mental strength.

6. Can stress make sleep feel lighter?

Stress can create hyperarousal. During the day this may feel like racing thoughts, irritability or muscle tension. At night it can make sleep onset more difficult and increase monitoring of the environment.

If a neighbor has woken you repeatedly for weeks, the problem can become partly conditioned. You lie down expecting the next bang, listen for footsteps and check the time whenever you hear something. The bedroom becomes associated with vigilance instead of sleep.

This is common in chronic insomnia. Removing the noise is still useful, but environmental control alone may not solve the problem if fear of the next awakening has become a major driver. Cognitive behavioral therapy for insomnia aims to reduce hyperarousal and rebuild the association between bed and sleep.

If you notice yourself actively listening for noise at bedtime, consider both the external sound and the internal state of alertness.

7. Does sleep deprivation make you less sensitive to noise?

After insufficient sleep, homeostatic sleep pressure is higher. People may fall asleep faster and often obtain stronger deep-sleep pressure early in the next sleep period. This can create the impression that exhaustion produces “heavier” sleep.

Using sleep deprivation as a strategy is not sensible. Chronic restriction impairs attention, mood and safety and can create its own sleep instability. Any short-term reduction in responsiveness is purchased at the cost of poorer waking function.

The goal is adequate, stable sleep in a reasonably protected environment, not becoming so exhausted that ordinary noise can no longer wake you.

8. Why can sounds wake me more easily toward morning?

Sleep architecture changes across the night. Slow-wave N3 sleep is generally more concentrated in earlier cycles. REM sleep becomes more prominent toward morning, and homeostatic sleep pressure has declined after several hours of sleep.

A sound that barely registered at midnight may therefore be more likely to reach conscious awareness at 5 or 6 a.m. This is normal physiology, not evidence that the final third of the night is low-value sleep. Morning sleep contains substantial REM and remains part of a normal sleep opportunity.

The environment also becomes louder toward morning: traffic increases, neighbors wake, heating systems change cycles and outdoor activity begins. A reduction in sleep pressure can coincide with a rise in external noise.

9. Are earplugs effective?

Earplugs are one of the most direct interventions when external noise is genuinely causing awakenings. Much clinical research comes from hospitals, where noise is unusually disruptive, but several randomized studies report better subjective sleep when patients use earplugs, sometimes together with eye masks.

A particularly relevant controlled study published in 2026 exposed 25 healthy adults to repeated environmental noise during seven nights of laboratory polysomnography. Earplugs mitigated nearly all measured effects of the intermittent noise under the tested conditions, although protection weakened at the highest sound level.

That result fits the basic logic: if the problem is sound entering the ear, direct attenuation may be more targeted than adding another sound to the room.

Safer earplug use

• choose a comfortable size and material;
• follow the manufacturer’s insertion instructions;
• do not force them deeply enough to cause pain;
• keep reusable plugs clean;
• stop if you develop pain, discharge or persistent irritation;
• make sure you can still respond to important safety alarms or caregiving responsibilities when necessary.

People with ear infections, recent ear surgery or significant ear-canal problems should seek advice before routine use.

10. Does white noise help?

White noise is intended to create a steady background that masks variation in the environment. A door slam stands out strongly in a very quiet room; against a constant background, the contrast may be smaller.

The idea is plausible, but the evidence has historically been weaker than marketing suggests. A 2020 systematic review of 38 studies found highly heterogeneous results: continuous broadband noise improved sleep in some studies and disrupted it in others. Using GRADE criteria, the authors considered the overall certainty of evidence for a sleep-improving effect very low.

Another systematic review of auditory stimulation reported positive findings in some white- and pink-noise studies, but interventions, populations and measurement methods differed substantially.

The key point is that “white noise works” is too broad. Sound color, volume, speaker position, baseline environment and individual sensitivity all matter.

11. What did the 2026 pink-noise study add?

The 2026 experiment is useful because it directly compared strategies under controlled intermittent environmental noise. Environmental noise reduced deep N3 sleep compared with a quiet control night. Pink noise altered REM sleep, and adding pink noise did not simply erase the effects of the intermittent sounds. Earplugs provided more consistent protection in the tested conditions.

One study is not enough to ban all broadband sound. It does challenge the assumption that adding continuous noise is always harmless. A sound designed to mask disruption is still an acoustic exposure.

If you already use white or pink noise and sleep well, there is no need to panic. Use the lowest effective volume, keep the source away from your head and periodically test whether it is genuinely helping.

12. What can I do in a noisy bedroom?

Start with the source and transmission path before buying multiple sleep products.

Identify the sound that actually wakes you

For several nights, record the approximate time of awakenings and what was happening. Traffic? Upstairs footsteps? Elevator? Heating? Partner snoring? Phone alerts? Pets?

A vague complaint of “light sleep” can sometimes turn out to have one predictable trigger at 5:40 a.m.

Remove controllable noise

Disable phone vibration, smartwatch alerts and unnecessary appliance sounds. Correct rattling fixtures or vibrating objects. Stop leaving background media running automatically if it is not helping.

Reduce transmission

Window seals, door seals, furniture placement and maintenance of rattling fixtures can sometimes reduce the disruptive peaks enough to matter.

Move the bed if practical

A headboard against a stairwell or elevator wall may receive more structural sound than another location.

Add earplugs when external intermittent noise remains

They are especially logical when the source cannot be controlled directly.

13. Could my partner be the real source?

Yes. Snoring, movement, alarms, phone use, breathing sounds and different bedtimes can fragment a partner’s sleep.

Loud snoring deserves particular attention when accompanied by witnessed breathing pauses, choking, gasping, morning headaches or significant daytime sleepiness. In that situation the sound is not merely an environmental nuisance; the person who snores may have obstructive sleep apnea.

Temporarily sleeping separately can protect sleep while a medical issue is being assessed, but treating the underlying cause is preferable when possible.

14. What if I wake up and only then notice the noise?

People often assume a sound caused an awakening because the sound is what they become aware of at that moment. Sometimes the sequence may be different. A respiratory event, a limb movement, reflux, pain, a hot flash or another internal event can produce an arousal first. Once awake, the person then notices traffic, a refrigerator compressor or a partner moving.

This is why repeated awakenings should not automatically be explained by “I am sensitive to noise.” Other causes include:

• chronic insomnia;
• obstructive sleep apnea;
• periodic limb movements;
• restless legs syndrome;
• pain;
• reflux;
• alcohol;
• medication effects;
• menopause-related symptoms;
• anxiety;
• irregular sleep timing;
• temperature discomfort.

Noise can be one contributor within a multi-factor sleep problem.

A practical clue is whether the awakenings persist when the environment becomes much quieter. If you sleep equally poorly in a quiet hotel room or with effective earplugs, the external sound may be less central than you first thought. Conversely, a large improvement after reducing noise supports an environmental contribution.

15. Can alcohol help me sleep through noise?

Alcohol can feel sedating and may shorten sleep-onset latency at sufficiently high doses, but it is not a safe noise-management strategy. Research shows that alcohol changes normal sleep architecture, particularly REM sleep, and it can worsen sleep-disordered breathing in susceptible people.

You may remember fewer environmental sounds after drinking without obtaining more restorative sleep. Repeatedly using alcohol to “sleep heavily” also introduces risks of tolerance and problematic use.

If the room is noisy, treat the room rather than trying to sedate yourself enough not to notice it.

16. What about melatonin, antihistamines or sleeping pills?

These are not general solutions to environmental noise. Melatonin is primarily a circadian timing signal in appropriate situations; it does not block auditory processing. Sedating antihistamines can produce drowsiness but also have adverse effects and are not a good long-term workaround for a noisy bedroom.

Prescription hypnotics have specific indications, benefits and risks and should be used according to medical guidance. They should not replace evaluation of sleep apnea, chronic insomnia or an environmental problem.

The safer hierarchy is to reduce sound exposure, improve the bedroom environment and treat any underlying cause of fragmentation.

17. Can the brain get used to noise?

Habituation is real. Predictable, repetitive background sound often becomes less noticeable over time. People who live near a road or railway frequently report that they “do not hear it anymore.”

Subjective habituation does not necessarily mean every physiological response disappears. Environmental-noise research suggests that sleep disruption and autonomic responses can persist despite long-term familiarity with a sound source.

You therefore do not need to expose yourself deliberately to loud noise in an attempt to become resistant. If meaningful reduction is possible, reducing the exposure is more rational.

18. Is sudden noise worse than steady noise?

For many sleepers, irregular peaks are more disruptive than a stable low-level background. The brain is designed to detect change. A continuous hum may become predictable, whereas a door slam, motorcycle acceleration or intermittent upstairs impact sound repeatedly creates a new event.

Average decibel level therefore does not describe the whole experience. Two bedrooms can have the same average nighttime sound level while one contains smooth traffic hum and the other has repeated sharp peaks. The second environment may feel much more disruptive.

This helps explain why a white-noise machine can sometimes feel useful: it reduces contrast between silence and an external peak. But the 2026 laboratory findings remind us that adding broadband sound is not physiologically neutral. When possible, lowering the peak itself is preferable to covering it with a louder continuous background.

19. What about low-frequency vibration and impact noise?

Not every disturbance reaches you only through the air. Footsteps, elevators, plumbing, subwoofers and building machinery can transmit vibration through floors and walls. Conventional foam earplugs may reduce airborne sound while doing little for structural vibration.

If you mainly feel rather than hear the disturbance, investigate the building source. Moving the bed away from a shared structural wall, adding isolation under a vibrating appliance or discussing building maintenance may help more than stronger earplugs.

This is also why “soundproof curtains” often disappoint people dealing with impact noise. Heavy curtains can reduce reflections and modestly affect some airborne frequencies, but they do not convert a normal wall or window into professional acoustic isolation.

20. Should you spend money on soundproofing?

Start with inexpensive diagnosis before major work. Identify whether the dominant path is the window, door, wall, ceiling or structure. A simple gap around a window can make external traffic sound much more noticeable, while expensive decorative foam panels may barely affect sound transmission from outside.

Acoustic foam is mainly designed to reduce reflections within a room. It is not the same as sound isolation. True isolation often requires mass, airtightness, decoupling and building-level changes.

For renters, practical steps may include better seals where allowed, a heavy bookcase on a shared wall, moving the bed, using earplugs and discussing unreasonable nuisance with the landlord or building manager when appropriate.

21. Can temperature make noise sensitivity feel worse?

Yes indirectly. When a room is too hot, too cold or uncomfortable, sleep may already be less stable. A sound that would normally remain below your awakening threshold can then become the final stimulus that wakes you.

The same is true for pain, congestion or reflux. Sleep fragmentation has multiple inputs. Optimizing noise while ignoring severe thermal discomfort may produce only a partial improvement.

Think of sleep stability as a system with several protective layers: adequate sleep pressure, a suitable circadian phase, comfortable temperature, low pain, stable breathing and a reasonably quiet environment. Weakening several layers at once makes awakenings more likely.

22. Why do parents wake to a child but sleep through traffic?

Meaning can influence salience. The sleeping brain does not process every sound identically. A parent may be highly responsive to a child’s cry while remaining relatively unresponsive to a familiar road sound. Studies of sleeping sensory processing support the broader idea that the brain continues to evaluate aspects of external information even during sleep.

This selectivity should not be exaggerated into the claim that you can consciously choose which sounds to hear while asleep. But it helps explain why simple decibel level does not fully predict awakening.

For caregivers, extremely strong hearing protection may be inappropriate if it prevents response to a child or a safety alarm. The sleep solution has to fit real responsibilities.

23. Is a fan a better masking sound than white noise?

A fan produces a relatively steady broadband mechanical sound and can also improve thermal comfort in warm conditions. Some people find it easier to tolerate than electronically generated noise.

The same caution applies: the fan should not be unnecessarily loud, and its airflow or temperature effects should not create another problem. If the room is already cool, direct airflow may be uncomfortable. If you use a fan specifically for masking, place it so that the sound is sufficient without blowing strongly at your face all night.

There is no evidence that a fan sound is universally superior to white, pink or brown noise. Preference and the type of external nuisance matter.

24. What about “brown noise” for sleep?

Brown noise emphasizes lower frequencies more strongly than white noise. It has become popular on streaming platforms, but popularity should not be confused with strong clinical evidence. Research on broadband noise for sleep is heterogeneous, and studies often use different acoustic spectra and levels.

If you personally find a low-level brown-noise track relaxing, that subjective effect can be useful. Do not assume it has a unique proven effect on deep sleep or the brain. Claims that one “color” of noise reliably increases a specific sleep stage are stronger than the current evidence supports.

25. Can earplugs damage hearing?

Properly used earplugs reduce sound exposure and are not expected to damage hearing simply by blocking sound. Problems are more likely to involve the ear canal: irritation, pressure, wax accumulation, poor hygiene or insertion trauma.

Do not insert dirty reusable plugs night after night. If a plug causes pain, stop using it. People who produce a lot of earwax, have recurrent external-ear infections or have undergone ear procedures may need advice on the best type.

Also remember that sleeping earplugs are not industrial hearing protection unless they are specifically rated and fitted for that purpose. The goals are different.

26. Can noise cause long-term health problems through sleep disruption?

Environmental-noise research goes beyond annoyance. Transportation noise has been studied in relation to cardiovascular and metabolic health, with sleep disturbance considered one plausible pathway among several. However, individual risk cannot be inferred from one noisy night or from a smartphone decibel reading.

Population studies evaluate repeated long-term exposure. The practical message for a person living in a noisy environment is not to become frightened by every sound, but to take persistent nighttime noise seriously enough to reduce it where feasible.

If you live next to major traffic and regularly wake throughout the night, addressing the environment is a legitimate health and quality-of-life issue rather than a luxury.

27. How do you measure bedroom noise at home?

Phone applications can provide rough orientation, but they are not calibrated professional sound-level meters. Different microphones, cases and software processing can produce different results.

For personal troubleshooting, exact laboratory accuracy may not be necessary. You can still identify patterns: whether a particular truck creates a large peak, whether closing a window changes the reading substantially, or whether an appliance produces repeated events.

Do not interpret a phone measurement as a formal legal or occupational acoustic assessment. If you need evidence for a building dispute or regulatory issue, a calibrated measurement by an appropriate professional is more useful.

28. A seven-night experiment to identify what wakes you

Nights 1 and 2: observe

Keep your normal routine and record:

• bedtime;
• estimated sleep onset;
• remembered awakenings;
• sound noticed around each awakening;
• final wake time;
• morning sleep quality from 1 to 5;
• alcohol, caffeine and naps;
• whether a partner noticed snoring or movement.

Nights 3 and 4: remove controllable noise

Use silent mode without vibration, disable unnecessary watch alerts, stop automatic television or audio, and correct obvious rattles or mechanical sounds.

Nights 5 and 6: test passive attenuation

If external intermittent noise remains, test comfortable earplugs used correctly. Try not to change several other sleep variables at the same time.

Night 7: compare the pattern

Review awakenings and daytime alertness. A clear improvement with noise reduction supports an environmental contribution. If sleep remains equally fragmented despite a large reduction in sound, look harder for other causes.

29. How do I stop noise from becoming an obsession?

Trying to create perfect silence can make sleep anxiety worse. You start checking every sound, waiting for the next neighbor movement and interpreting minor noise as proof that the night is ruined.

A realistic bedroom needs to be quiet enough and predictable enough, not acoustically perfect. Homes and cities always contain some background sound.

After addressing the major nuisance sources, reduce monitoring rather than expanding it. If fear of the next sound becomes more disruptive than the sound itself, cognitive behavioral therapy for insomnia can help reduce conditioned hyperarousal.

A useful mental shift is from “I must not hear anything” to “I have reduced the major disturbances and my brain is capable of returning to sleep after ordinary background sound.”

30. When should I seek medical assessment?

Professional evaluation is appropriate when noise sensitivity occurs alongside:

• major daytime sleepiness or fatigue;
• repeated awakenings even in a quiet environment;
• loud snoring with witnessed breathing pauses;
• choking or gasping awakenings;
• repeated limb movements;
• significant nighttime pain;
• insomnia lasting weeks or months;
• major mood deterioration;
• falling asleep while driving or during other safety-critical activities.

A clinician can help distinguish environmental sleep disruption from insomnia, sleep apnea, movement disorders and other causes.

31. Frequently asked questions

Why do I wake up at every small noise?

The sleeping brain continues to process some sound. Sudden, irregular or sufficiently loud noise can trigger a brain response or full awakening. Stress, age, sleep stage and individual sensitivity all influence the threshold.

Does that mean I do not get enough deep sleep?

Not necessarily. Waking to noise cannot by itself tell you how much N3 sleep you obtain. Consumer trackers also cannot diagnose a deep-sleep deficiency.

Are earplugs better than white noise?

When the problem is intermittent external sound, direct attenuation with earplugs is often logical. A 2026 controlled laboratory study found earplugs more consistently protective than pink noise under the tested conditions. Individual comfort and safety still matter.

Does white noise really improve sleep?

Research findings are mixed. Some studies report benefits, others report no effect or disruption. Systematic reviews have emphasized substantial heterogeneity and low certainty for a general benefit.

How loud should a white-noise machine be?

There is no universal ideal level. Use the lowest level that actually masks the target sound, keep the source away from the head and avoid unnecessarily high exposure.

Is it normal to wake several times per night?

Brief awakenings can occur normally between sleep cycles. They become more concerning when frequent, prolonged, associated with symptoms or followed by impaired daytime function.

Do I need a completely silent room?

No. Many people sleep well with low, stable background sound. Sudden and irregular peaks are often more disruptive than a modest continuous background.

Why does my partner never wake to the same noise?

Arousal thresholds vary by individual, sleep stage, age, hearing and other factors. Noise sensitivity is not a matter of willpower.

Should I use noise-cancelling headphones to sleep?

Bulky active-noise-cancelling headphones may be uncomfortable for side sleeping and can create pressure points. Some sleep-specific devices are flatter, but comfort, battery safety and the need to hear alarms must be considered. Passive earplugs are simpler for many people.

Can I become dependent on white noise?

Not in the pharmacological sense. Some people become accustomed to sleeping with a particular background and find silence unfamiliar when travelling. Periodically testing nights without it can help determine whether the device is still necessary.

Conclusion

Waking at every little noise does not prove that your brain is stuck in “light sleep.” Normal sleep continues to process auditory information, and sounds can produce responses ranging from a K-complex to a brief arousal or full awakening. Repeated environmental noise is nevertheless a legitimate cause of sleep fragmentation, supported by epidemiological studies, laboratory experiments and systematic reviews.

The most rational strategy starts with the environment: identify the disruptive sounds, remove controllable sources, reduce transmission and use comfortable earplugs when appropriate. White, pink or brown noise may help some sleepers by reducing contrast, but the evidence does not support treating broadband sound as universally beneficial. Keep any masking sound moderate and do not add more acoustic exposure than necessary.

Finally, do not assume that every awakening is caused by the noise you notice after opening your eyes. If sleep remains fragmented in a quiet room, or if you have snoring, breathing pauses, dangerous sleepiness, pain or persistent insomnia, investigate the underlying cause. “Light sleep” describes how the night feels; the useful clinical and practical question is what is actually disrupting it.

Key scientific references

1. Basner M, McGuire S. WHO Environmental Noise Guidelines for the European Region: A Systematic Review on Environmental Noise and Effects on Sleep. PMID 29538344. https://pubmed.ncbi.nlm.nih.gov/29538344/
2. Smith MG et al. Environmental Noise and Effects on Sleep: An Update to the WHO Systematic Review and Meta-Analysis. 2022. PMID 35857401. https://pubmed.ncbi.nlm.nih.gov/35857401/
3. Li Z. Environmental Noise Exposure and the Risk of Sleep Disturbance: A Systematic Review and Meta-Analysis. Noise Health. 2026. PMID 42085091. https://pubmed.ncbi.nlm.nih.gov/42085091/
4. Ebben MR et al. Noise as a sleep aid: A systematic review. Sleep Medicine Reviews. 2020. PMID 33007706. https://pubmed.ncbi.nlm.nih.gov/33007706/
5. Systematic review: auditory stimulation and sleep. PMID 34964434. https://pubmed.ncbi.nlm.nih.gov/34964434/
6. K-complexes are a sensitive marker of noise-related sensory processing during sleep: a pilot study. PMID 33710307. https://pubmed.ncbi.nlm.nih.gov/33710307/
7. Efficacy of pink noise and earplugs for mitigating the effects of intermittent environmental noise exposure on sleep. Sleep. 2026. PMID 41627391. https://pubmed.ncbi.nlm.nih.gov/41627391/
8. Bahcecioglu Turan G et al. The effects of eye masks and earplugs on sleep quality...: A randomised controlled study. Journal of Sleep Research. 2024. PMID 37723617. https://pubmed.ncbi.nlm.nih.gov/37723617/
9. Van Rompaey B et al. The effect of earplugs during the night on the onset of delirium and sleep perception: a randomized controlled trial. PMID 22559080. https://pubmed.ncbi.nlm.nih.gov/22559080/

Editorial note: this content is educational and is not a diagnosis. Dangerous daytime sleepiness, witnessed breathing pauses, choking awakenings or persistent insomnia warrant professional evaluation.

Editorial note: this guide is educational and does not replace medical assessment when sleepiness, insomnia or a sleep-timing disorder impairs function or safety.