Sleeping with air conditioning: good or bad for sleep?
Bedroom temperature, dry air, cough, all-night use, children and practical settings for hot nights.
Read article βSleep environment
Sleep, energy and performance
Sleep better. Eat better. Move better. Think better. Explore Sleeple by topic or start with one precise question.
π§ Brain & memoryLearning, memory, and mental fatigue
π₯ Nutrition & energyCaffeine, meals, rhythms, and alertness
π Sport & recoveryTraining, sleep, napping, and fatigue
π― ProductivityAttention, organization, and habits
π Cluster sommeil
Night awakenings
Understand why sleep becomes fragmented and what to do depending on the situation.
π§ Performance cluster
Brain & memory
Memory, learning, concentration, mental fatigue and brain recovery.
π Sport cluster
Sport & recovery
Sleep, training, naps and muscle recovery to manage training load more effectively.
π₯ Nutrition cluster
Nutrition & energy
Caffeine, nutrition and sleep debt: understand what actually affects energy and rest.
Sleep environment
Sleeping with a fan on: is it safe or bad for sleep?
All-night fan use, cough, allergies, dry eyes, ceiling fans and heat: what the evidence actually says.
Read article βSleep, exercise & hormones
Does lack of sleep lower testosterone?
Five-hour nights, all-nighters, sleep apnea, training and libido: what controlled human studies actually show.
Read article βSleep physiology
Deep sleep: how much do you really need?
N3, age, trackers and recovery: why there is no universal quota and how to support healthy sleep architecture.
Read article βSleep & health
Sleep apnea: which signs should raise concern?
Snoring, witnessed pauses, daytime sleepiness, home testing and polysomnography: when to seek evaluation.
Read article βSleep & health
Is sleeping too much bad for your health?
Long sleep, natural long sleepers, hypersomnia, health associations and reverse causality: how to interpret 9, 10 or 11 hours.
Read article βSleep & environment
Screens before bed: what is the real impact on sleep?
Blue light, bedtime delay, social media and night mode: the mechanisms actually supported by sleep research.
Read article βNutrition & sleep
Does magnesium really help you sleep?
Glycinate, citrate, L-threonate, dose, deficiency and safety: what clinical trials actually show.
Read article βSleep & supplements
Melatonin for sleep: does it really work and is it safe?
Insomnia, circadian timing, dose, side effects and interactions: what clinical evidence and safety guidance show.
Read article βSleep tracking
How accurate are sleep trackers, smartwatches and rings?
Sleep duration, awakenings, deep sleep, REM and sleep scores: what 2025-2026 validation studies actually show.
Read article βNutrition & energy
Lack of sleep and weight gain: does sleeping less make you gain weight?
Calories, appetite, metabolism and visceral fat: what controlled human sleep-loss trials actually show.
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Tired but canβt sleep: why?
Fatigue, sleepiness, circadian timing, hyperarousal, caffeine and stress: why being exhausted does not guarantee sleep.
Read article βBrain & memory
Sleep and memory: how is learning consolidated?
What happens before and after learning, without assigning all memory to one sleep stage.
Read article βNutrition & energy
Nutrition and sleep: what does evidence show?
Caffeine, alcohol, late dinners, and meal timing: useful guidance and its limits.
Read article βSport & recovery
Sleep and athletic recovery: what do we know?
Consensus, study limits, and simple indicators linking sleep and training load.
Read article βProductivity
Sleep, concentration, and productivity
Attention, working memory, decisions, and a realistic way to plan a fatigued day.
Read article βBrain & memory
Sleep deprivation, learning and memory
Attention, encoding and consolidation: what a short night may actually change.
Read article βSleep & neurology
Restless legs syndrome
Recognise the urge to move, distinguish it from cramps and understand assessment and current treatment guidance.
Read article βSleep & mental health
Sleep and mental health
Understand the two-way relationship, warning signs and when to seek help.
Read article βSleep & diagnosis
Polysomnography: understanding the sleep study
Sensors, preparation, overnight process, results and the difference from a respiratory home study.
Read article βSleep & neurology
Parkinsonβs disease and sleep
Insomnia, sleepiness, dream enactment and medicines: understand the causes and prepare for assessment.
Read article βSleep & hormones
Sleep and growth hormone: what is the link?
Deep sleep, night-time release, recovery and common myths: what the evidence actually supports.
Read article βSleep & health
Can you sleep in compression socks?
The general rule, prescribed exceptions and warning signs that mean you should take them off.
Read article βNutrition & energy
Caffeine and sleep: when should you stop?
Dose, timing and sensitivity: use six hours as a starting point, not a universal rule.
Read article βSport & recovery
Evening exercise and sleep
Intensity, finishing time, and a simple method to observe your response.
Read article βProductivity
Fatigue, focus and procrastination
What sleep may explain β and what it does not β when starting feels difficult.
Read article βπ
Sleep
Why Do I Keep Waking Up at Night?
Understand the common causes of repeated awakenings, what you can try and when persistent symptoms need medical advice.
Read article ββ°
Sleep
Why Do I Keep Waking Up at 3 AM?
Learn the evidence-based causes of repeated 3 AM waking, the myths the clock time cannot prove and practical next steps.
Read article ββ©οΈ
Sleep
How to Fall Back Asleep After Waking Up
Follow an evidence-based stimulus-control plan without clock-watching, forcing sleep or turning the bed into a place of struggle.
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Sleep
Waking Up Sweating at Night: Causes and Warning Signs
Separate an overheated room from recurrent night sweats and recognise warning signs that deserve medical advice.
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Nap
Napping: Ideal Duration, Best Time and Practical Method
Compare 10, 20 and 90-minute naps, understand sleep inertia and find a time that protects your night sleep.
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Nap
Micro-Nap: Recover in 5 to 10 Minutes
Use a 5 to 10-minute micro-nap as a short rest without forcing sleep.
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Nap
Best Time to Nap Without Hurting Night Sleep
Find a nap time that fits your bedtime, chronotype and tendency to struggle with sleep.
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Nap
Why Do I Feel More Tired After a Nap?
Understand sleep inertia and adjust nap duration, timing and your wake-up buffer.
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Sport
Nap and Sport: Before or After Training?
Compare napping before and after training, useful durations and the wake-up buffer.
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Performance
Napping at Work: Duration and Office Routine
Plan a short workplace nap with a safe place, alarm, wake-up buffer and clear limits.
Read article ββ
Nap
Coffee Nap: Method, Evidence and Precautions
Learn how a caffeine nap works, how to time a short nap and when this method should be avoided.
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Science
Understanding Sleep: Biological Mechanisms, Cycles and Benefits
Explore the biological mechanisms of sleep, its cycles and its essential roles for the body and brain.
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Sleep
Why Am I Tired Even After 8 Hours of Sleep?
Learn how sleep quality, awakenings, body clock and sleep apnoea can affect recovery, and when to seek advice.
Read article ββ³
Sleep
How Many Hours of Sleep Do You Need by Age?
See recommended sleep duration from newborns to older adults, how naps count and how to judge whether you get enough sleep.
Read article βπ§
Wellness
Cannot Sleep Because of Racing Thoughts? What to Do
Try a practical seven-step method grounded in CBT-I principles and learn when persistent insomnia needs professional help.
Read article ββ°
Sleep
What Time Should You Go to Bed for Your Wake-Up Time?
Calculate a realistic bedtime from your wake-up time and sleep need without treating 90-minute cycles as an exact rule.
Read article βπ
Sleep
Sleep Debt: How to Estimate It and Recover
Estimate weekly sleep debt without false precision and build recovery across several nights.
Read article ββ
Nutrition
Coffee and Sleep: How Long Before Bed Should You Stop?
Understand the role of dose and sensitivity, then test a practical caffeine cut-off before bedtime.
Read article βπ‘οΈ
Sleep
What Is the Ideal Temperature for Sleep?
Use 18Β°C as a practical starting point, then adjust room temperature, bedding and airflow to your comfort.
Read article βποΈ
Sleep
Back, Side or Stomach: Which Sleeping Position Is Best?
Compare sleeping positions for reflux, snoring, sleep apnoea, pregnancy and pain, with practical pillow adjustments.
Read article βπ΄
Sleep
Snoring: Understanding, Preventing and Treating
Understand snoring mechanisms, risk factors and evidence-based options, including when sleep apnoea should be considered.
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Sleep
Sleep Problems: Understanding, Preventing and Improving
Review common sleep problems, their causes and practical ways to improve sleep sustainably.
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Science
REM Sleep: Complete Guide, Benefits and Ways to Improve It
Understand REM sleep, its roles, why we dream and practical habits that can protect this sleep phase.
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Performance
Brain Recovery: Strategies for a Rested and Performing Brain
Explore sleep, naps, breaks and lifestyle strategies that support cognitive recovery.
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Sport
Muscle Recovery: Science-Validated Techniques
Review the major recovery levers, including sleep, nutrition, hydration, active recovery and training load.
Read article ββ€οΈ
Science
Sleep and Cardiovascular Health: The Scientific Guide
Learn how sleep duration, sleep quality and sleep apnoea can affect cardiovascular health.
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Sleep
Most Asked Questions About Sleep
Read clear answers to common questions about sleep duration, insomnia, snoring, naps and recovery.
Read article βπ
Sleep
Complete Guide to Sleep: Your Questions Answered
Explore insomnia, sleep apnoea, melatonin, sleep paralysis, REM sleep, deep sleep and bedtime routines.
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