The Good-Sleep Prescription
A day-through-night routine that aligns your circadian system for deep sleep
- Difficulty
- Moderate
- Time to result
- ~weeks to results
- Steps
- 6
- Confidence
- 80%
Potter frames good sleep as a full-day prescription rather than a bedtime trick. Daytime work sets up the night: physical activity and cognitively demanding work build adenosine and sleep pressure, while abundant bright light early anchors the circadian clock. In the evening a roughly two-hour 'digital sunset' cuts blue-light exposure, an alarm cues the start of a wind-down routine, and the bedroom is kept uncluttered, dark and reserved for sleep and sex. Temperature is engineered deliberately: a ~10-minute hot shower around 40°C an hour before bed, warm socks, a cool room and a fan all help the body radiate heat and drop core temperature to initiate sleep. Caffeine is cut about nine hours before bed and alcohol avoided as a false sedative.
Origin
Given by Dr. Greg Potter on Modern Wisdom when host Chris Williamson asked him to 'write a prescription' of sleep principles, synthesising circadian and thermoregulation research.
Core principles
- 01Good sleep is built during the daytime, not just at bedtime.
- 02Light is the strongest signal that sets your body clock.
- 03You fall asleep by dropping core temperature, so help heat escape.
- 04Treat sleep as a cared-about daily habit, like brushing your teeth.
How to run it
- 1
Load the day with activity and light
Be physically active, do cognitively demanding work, and get lots of bright light, ideally outdoors, so you build sleep pressure and anchor your clock.
Pro tip Meditation counts as taxing 'work' and independently improves sleep via stress regulation.
- 2
Run a two-hour digital sunset
Roughly two hours before bed, start reducing light exposure, especially blue light. Use f.lux, Night Shift or Twilight on devices, or dimmer warm lighting.
Pro tip Blue-blocking glasses work too if you'll actually wear them consistently.
- 3
Alarm the start of your wind-down
If your routine takes an hour, set an alarm for one hour before your target bedtime so you reliably begin preparing for sleep on time.
- 4
Engineer a heat-shedding bedroom
Keep the room dark with blackout blinds or a sleep mask, comfortable but cool, and use breathable bedding. A fan cools you and adds white noise.
Pro tip Reserve the bedroom for sleep and sex only and keep it uncluttered and stress-free.
Watch out Don't overheat the room; a too-warm or too-cold environment is a stressor that fragments sleep.
- 5
Use temperature to trigger sleep
Take a ~10-minute hot shower at about 40°C within an hour of bed, then keep your feet warm with socks so heat radiates from your extremities and core temperature drops.
Pro tip Warm feet help you fall asleep faster and stay asleep; a sleep mask hides the socks if that bothers a partner.
- 6
Fix caffeine and alcohol timing
Stop caffeine roughly nine hours before bed (its half-life is ~6 hours) and don't rely on alcohol, which sedates and fragments later sleep rather than producing real sleep.
Pro tip Cap caffeine at about 2mg per kg of body mass.
Watch out Alcohol boosts early deep sleep but wrecks later REM as the liver clears it.
In the wild
An office worker who scrolls in bed and drinks coffee all afternoon adopts the prescription: morning walk for light, a hard block of focused work, coffee finished by early afternoon, screens dimmed two hours before bed, a hot shower an hour out, socks on, fan running, room cool and dark. Over a few weeks their time-to-sleep shortens and they wake clearer.
→ Consistently faster sleep onset and better-quality, less-fragmented sleep.
Common mistakes
Only fixing bedtime
Treating sleep as a bedtime problem ignores that daytime light, activity and cognitive load set up the night's sleep pressure and clock timing.
Overheating the bedroom
A warm room blocks the core-temperature drop needed to initiate sleep; the room should be comfortable but cool.
Using alcohol to fall asleep
Alcohol sedates rather than producing physiological sleep and fragments the second half of the night as it clears.
Is it for you?
Best for
Anyone with a fairly regular schedule who wants to systematically improve sleep quality.
Not ideal for
People with clinical insomnia, who should start with CBT-I rather than hygiene tweaks alone.
From the transcript
“during the day you want to be physically active ... you also want to expose yourself to lots of bright light”
“keep it uncluttered and use it for sleep and sex only”
“raise the temperature of the skin by a couple of degrees shortly before sleep ... a simple way to achieve that is a hot shower”
From the episode
The Definitive Guide To Sleep - Dr Greg Potter - #027
Dr Greg Potter