The Six-Part Sleep Hygiene Checklist
Shape six daily conditions that give sleep a better chance
- Difficulty
- Moderate
- Time to result
- ~ongoing to results
- Steps
- 6
- Confidence
- 99%
Walker groups his practical sleep-hygiene advice into six recurring checks: regular timing, darkness before bed, a cool bedroom, leaving the bed when prolonged wakefulness sets in, thoughtful caffeine timing, and avoiding alcohol as a sleep aid. The proposed mechanism is environmental and associative: regularity gives the brain a stable schedule; darkness supports the nighttime signal; cooling helps the body reach the temperature change associated with sleep; leaving the bed interrupts learned wakefulness; and reducing late caffeine or alcohol avoids stimulant, sedation, fragmentation, and sleep-stage effects he describes. The checklist is a general experiment grounded in his interview guidance, not a guarantee of better sleep or individualized medical treatment.
Origin
Extracted from The Diary of a CEO. Matthew Walker presents these measures near the end of the episode as tried-and-true sleep-hygiene steps to test before buying supplements.
Core principles
- 01Give the brain a consistent sleep schedule
- 02Use darkness and cool temperature as biological cues
- 03Keep wakefulness from becoming associated with the bed
- 04Treat caffeine and alcohol as factors that can impair sleep
- 05Test established basics before buying supplements
How to run it
- 1
Set a Regular Schedule
Choose a consistent bedtime and wake time and keep both steady across the week. Walker says the brain expects and benefits from regularity.
Pro tip Protect wake time as well as bedtime, including at weekends.
Watch out The transcript gives general guidance, not a schedule tailored to shift work or a sleep disorder.
- 2
Create Evening Darkness
During the last hour before bed, switch off or dim a large share of household lighting while remaining safe. Use the change as a behavioural cue that nighttime has begun.
Pro tip Run it as a one-week experiment and notice whether sleepiness arrives more readily.
Watch out Do not make rooms so dark that moving around becomes unsafe.
- 3
Cool the Bedroom
Aim for an ambient bedroom temperature around 18 to 18.5 degrees Celsius if that is safe and tolerable. Walker says a cooler environment supports the drop in body and brain temperature associated with sleep.
Pro tip Use socks or a hot-water bottle for comfort while keeping the surrounding room cool.
Watch out Temperature needs vary; safety and medical needs take priority over a fixed number.
- 4
Break Prolonged Wakefulness
If you remain awake for about 30 minutes, leave the bed and do something relaxing elsewhere. Return only when sleepy so the bed is repeatedly paired with sleep rather than wakefulness.
Pro tip Read, stretch, meditate, or listen without beginning work or scrolling.
Watch out Do not eat during the reset, because Walker says that can train a new nighttime waking routine.
- 5
Choose a Caffeine Cutoff
Work backward from bedtime using Walker's stated caffeine half-life of roughly five to six hours. Reduce or move caffeine earlier if it appears to affect sleep onset, anxiety, or restoration.
Pro tip Remember that feeling able to fall asleep does not establish that caffeine had no sleep-stage effect.
Watch out Sensitivity and metabolism vary between people.
- 6
Separate Alcohol from Sleep Treatment
Do not use alcohol as a tool for inducing sleep. Walker describes it as sedation rather than natural sleep and says it can fragment sleep and suppress REM sleep.
Pro tip If you choose to drink, make the trade-off consciously rather than labelling it a sleep aid.
Watch out This framework does not provide medical guidance for alcohol dependence or withdrawal.
In the wild
Walker asks listeners to dim or switch off half to three quarters of their household lights during the final hour before bed for one week. The person keeps enough light for safety and observes whether the darker environment produces a clearer feeling of sleepiness.
→ The person tests one environmental cue before buying a supplement.
Illustrative example: someone holds wake time steady, dims lights, cools the bedroom, moves coffee earlier, stops treating a nightcap as a sleep solution, and uses the 30-minute reset when needed. They change only these transcript-backed conditions and observe the pattern over several nights.
→ Sleep conditions become measurable habits rather than a search for a single cure.
Common mistakes
Changing Only Bedtime
Walker specifies both bedtime and wake time, including weekends, as parts of regularity.
Buying Supplements Before Testing Basics
He recommends trying the established environmental and behavioural measures before spending money on sleep supplements.
Treating Sedation as Sleep
Walker distinguishes alcohol-induced sedation from sleep and says alcohol can fragment sleep and block REM sleep.
Is it for you?
Best for
It is best for adults who want to improve ordinary sleep habits before spending money on unproven supplements.
Not ideal for
It is not a diagnosis or substitute for professional care for persistent insomnia, sleep apnea, or another medical condition.
From the transcript
“the first thing is regularity”
“make your bedroom cold make it dark like a cave”
“alcohol is not a sleep aid”
From the episode
Matthew Walker: The World’s No.1 Sleep Expert (The 6 Sleep Hacks You NEED!)