What Is Sleep Hygiene? A Simple Guide to Better Nightly Habits

Reviewed by the Sleep Well Tips team using peer-reviewed sleep research

What Sleep Hygiene Means

Sleep hygiene is a set of daily habits that support your ability to fall asleep and stay asleep. The term covers your schedule, your bedroom environment, and what you eat and drink before bed.

The American Academy of Sleep Medicine (AASM) defines sleep hygiene as a series of healthy sleep habits that improve your sleep health. In 2024, 30.5% of U.S. adults slept less than seven hours a night on average, according to the CDC. Only 54.8% of adults reported waking up feeling well-rested most days. Sleep hygiene targets the daily behaviors behind numbers like these.

Does Sleep Hygiene Fix Insomnia?

Sleep hygiene helps most people sleep better, but it has limits worth knowing.

The AASM’s 2021 clinical practice guideline advises against using sleep hygiene alone to treat chronic insomnia disorder. For diagnosed insomnia, the guideline recommends cognitive behavioral therapy for insomnia (CBT-I), stimulus control, sleep restriction therapy, or relaxation therapy instead. Sleep hygiene still plays a role. AASM describes it as an important part of CBT-I, combined with the other techniques rather than used on its own.

For everyday sleep problems, not diagnosed insomnia, the habits below give you a solid starting point.

Keep a Consistent Sleep Schedule

Your circadian rhythm, the internal clock that regulates sleepiness and alertness, runs on roughly a 24-hour cycle. Going to bed and waking up at the same time every day, including weekends, keeps this rhythm steady.

AASM recommends getting up at the same time daily and setting a bedtime early enough for seven to eight hours of sleep. Large swings between weekday and weekend sleep times, sometimes called social jet lag, throw off your internal clock the same way crossing time zones does.

If your schedule feels off track, this guide on fixing a messed-up sleep schedule walks through how to reset it gradually.

Get Morning Sunlight

Natural light exposure early in the day reinforces your circadian rhythm and helps you feel sleepy at the right time that night. Spend time near a window or outside soon after waking, especially if you wake up before the sun feels bright.

Evening light works against you. Bright light, especially the blue wavelengths from screens, delays your body’s release of melatonin, the hormone that signals it’s time to sleep. Harvard researchers found blue light suppressed melatonin for about twice as long as green light of the same brightness and shifted circadian timing by twice as much.

Watch Your Caffeine Timing

Caffeine’s half-life ranges from 2 to 10 hours, and genetics account for a large part of that variation. A systematic review and meta-analysis of 24 studies, published in Sleep Medicine Reviews, found caffeine reduced total sleep time by an average of 45 minutes and cut sleep efficiency by 7%. The review recommends drinking your last cup of coffee at least 8.8 hours before bedtime to avoid these effects.

If you already know caffeine tends to catch up with you at night, this guide on sleeping after drinking caffeine covers what helps once it’s already in your system.

Limit Alcohol Before Bed

Alcohol makes some people fall asleep faster, but it comes at a cost. A 2024 systematic review and meta-analysis of 27 studies found that even a low dose, around two standard drinks, reduced REM sleep. The effect worsened with higher doses. REM sleep supports memory consolidation and emotional regulation, so cutting it short reduces how restorative your night feels, even if total hours in bed stay the same.

Time Your Exercise

Regular exercise supports better sleep, but timing matters if your workouts run intense.

A 2025 Nature Communications study from Monash University, the largest of its kind, tracked over 14,000 people across 4 million nights using wearable sensors. Strenuous exercise ending less than four hours before bedtime was linked to delayed sleep onset, shorter sleep duration, lower sleep quality, and a higher nighttime heart rate. Moderate exercise showed no such disruption, and workouts finishing four or more hours before bed showed none either. If you train hard in the evening, aim to finish at least four hours before you plan to sleep.

Build a Wind-Down Routine and Limit Screens

A relaxing routine before bed signals to your body that sleep is coming. AASM recommends turning off electronic devices at least 30 minutes before bedtime and keeping evening light dim.

Simple wind-down habits include reading, light stretching, or a warm shower. Avoid intense conversations, work email, or news right before bed, since these keep your mind alert instead of winding down.

Keep Your Bedroom Cool, Dark, and Quiet

Your bedroom environment affects both how fast you fall asleep and how well you stay asleep. Sleep Foundation research recommends a bedroom temperature between 65 and 68°F (18 to 20°C) for most adults. Block outside light with blackout curtains or a sleep mask, and reduce noise with a white noise machine or earplugs.

If noise is your main obstacle and earplugs aren’t comfortable, these earplug alternatives cover other ways to block sound.

Use Your Bed Only for Sleep

AASM recommends reserving your bed for sleep and sex only. Working, eating, or watching television in bed weakens the mental association between your bed and sleep. Over time, that makes it harder for your brain to switch into sleep mode once you lie down.

If you don’t fall asleep within 20 minutes, get up. Do a quiet activity in low light until you feel sleepy, then return to bed.

Nap With Care

Naps help with alertness, but poorly timed naps interfere with nighttime sleep. Keep naps short, generally 20 to 30 minutes, and avoid napping late in the afternoon or evening. If you already struggle to fall asleep at night, skipping naps altogether often helps more than napping does.

When Sleep Hygiene Isn’t Enough

Sleep hygiene works well for everyday sleep problems, but it isn’t a cure for every sleep issue. If you consistently struggle to fall asleep, stay asleep, or feel rested despite following these habits for several weeks, talk to a doctor. Persistent insomnia sometimes points to an underlying condition, and CBT-I or another targeted treatment often works better than habit changes alone.

Sources

Healthy Sleep Habits. American Academy of Sleep Medicine, Sleep Education.
Edinger JD, Arnedt JT, Bertisch SM, et al. “Behavioral and Psychological Treatments for Chronic Insomnia Disorder in Adults.” Journal of Clinical Sleep Medicine, 2021.
Ng AE, Black LI, Adjaye-Gbewonyo D. “Short Sleep Duration and Sleep Difficulties Among Adults: United States, 2024.” NCHS Data Brief No. 559, CDC.
“Blue Light Has a Dark Side.” Harvard Health Publishing.
“The Effect of Caffeine on Subsequent Sleep: A Systematic Review and Meta-Analysis.” Sleep Medicine Reviews, 2023.
“The Effect of Alcohol on Subsequent Sleep in Healthy Adults: A Systematic Review and Meta-Analysis.” Sleep Medicine Reviews, 2024.
Leota J, et al. “Dose-Response Relationship Between Evening Exercise and Sleep.” Nature Communications, 2025.
“What’s the Best Temperature for Sleep?” Sleep Foundation.