Sleep hygiene is over-marketed and under-explained. The supplement industry, mattress companies, and an entire wing of wellness content have turned sleep advice into a maze. The actual evidence-based fundamentals are simple, mostly free, and consistently effective.
This is the no-nonsense version, in rough order of impact.
The single highest-leverage rule: a consistent wake time
If you do nothing else, do this. Wake up at the same time every day, including weekends.
The mechanism: your body has a circadian rhythm, a roughly 24-hour internal clock that regulates sleep, hormones, body temperature, and a hundred other things. Wake time is the strongest single signal to that clock. Anchoring wake time stabilises your circadian rhythm more reliably than anchoring bedtime, because going to sleep is a passive process you can’t force, while waking is something you can control.
Practical version:
- Pick a wake time you can sustain on weekdays and weekends. 7am is common; whatever works for your life.
- Get up when the alarm goes. Don’t snooze for an hour.
- Get bright light into your eyes within 30 minutes of waking (open the curtains, step outside, sit by a window). This reinforces the signal.
Most people see meaningful sleep improvement within 2-3 weeks of consistent wake times.
Light: bright morning, dim evening
Your circadian rhythm runs on light signals. The pattern that works:
- Bright light in the morning. Outdoor light is ideal (even on a cloudy day, outdoor light is much brighter than indoor lighting). 10-20 minutes within an hour of waking.
- Bright light during the day. Keep your workspace light. Take breaks outside.
- Dim light in the evening. Lower lights in the 2 hours before bed. Lamps over overhead lights.
- Dark for sleep. Blackout curtains or an eye mask. Even small amounts of light can disrupt sleep quality.
Screens fit into this. Blue light from phones and computers suppresses melatonin. The simple intervention: no screens for 30-60 minutes before bed. If that’s unrealistic, use night mode and reduce brightness aggressively in the evening.
Caffeine: cut it earlier than you think
Caffeine has a half-life of around 5 hours. That afternoon coffee at 3pm is still half-active in your system at 8pm.
Practical rule: no caffeine after midday. Even if you “feel fine” after a 4pm coffee, it’s still affecting sleep depth and architecture even when it doesn’t affect onset.
If quitting caffeine entirely sounds dramatic, just shift the morning. Two coffees in the morning > one coffee at midday.
Bedroom environment
The boring but effective list:
- Cool. 16-19°C is ideal for most people. Your body temperature drops during sleep; a cool room supports this.
- Dark. Blackout curtains or an eye mask. Tape over the LED lights on chargers and appliances.
- Quiet. White noise or earplugs if you live somewhere noisy. Don’t tolerate a noisy environment if you can avoid it.
- Comfortable bed. Worth investing in a mattress and pillows that suit you, since you spend a third of your life there.
- No screens. The bed is for sleep and sex. Not for scrolling, work, or watching things on your laptop. This trains your brain to associate bed with sleep.
What about exercise?
Helps, but timing matters.
- Daily movement of any kind improves sleep.
- Vigorous exercise late in the evening (within 2 hours of bed) can interfere with sleep for some people.
- Morning or early-afternoon exercise has the most consistent benefit for sleep.
Don’t overthink it. Any consistent movement is better than the theoretical perfect routine you don’t do.
What about food?
A few patterns:
- Heavy meals within 2 hours of bed often disrupt sleep
- Alcohol falls asleep faster, sleeps worse (fragmented, less REM)
- A small light snack if you’re hungry doesn’t hurt; a heavy meal does
- Don’t go to bed thirsty; do moderate water intake earlier rather than chugging right before bed
The wind-down
The hour before bed matters. A consistent wind-down trains your brain to expect sleep:
- Dim lights
- No screens (or aggressive blue-light reduction)
- Calm activities: reading, gentle music, light stretching, conversation
- A consistent sequence of small things (brush teeth, set out clothes for tomorrow, read for 20 minutes, lights off). Sequence becomes signal.
What to do if you can’t sleep
The single most important and counterintuitive rule: if you’ve been awake for more than 20 minutes, get up.
Don’t lie there. Lying in bed unable to sleep trains your brain to associate bed with wakefulness. Get up, go to another room, do something calm and not screen-based (read a paper book, listen to a podcast), and return to bed when you feel sleepy.
This is the core of CBT for Insomnia, which is the most effective treatment for chronic insomnia.
When sleep hygiene isn’t enough
Sleep hygiene helps mild and moderate sleep difficulties. For chronic insomnia (3+ nights a week for 3+ months), sleep hygiene alone usually isn’t enough. The interventions that actually work for chronic insomnia:
- CBT-I (CBT for Insomnia), available through NHS Talking Therapies and privately. Strong evidence base, outperforms sleeping medication for most people.
- Short-term sleeping medication, prescribed by a GP. Useful as a bridge, not a long-term solution.
- Treating underlying causes: depression, anxiety, sleep apnoea, hormonal issues. If sleep didn’t improve with hygiene work, what else is going on?
If you suspect sleep apnoea (loud snoring, gasping, daytime sleepiness despite enough sleep), ask your GP specifically for a sleep study.
Where to next
- Why can’t I sleep? A queer-affirming guide to insomnia covers the broader picture including queer-specific factors.
- How to fall asleep when your mind is racing for the rumination side specifically.
- Anxious thoughts at 3am: a survival guide for middle-of-the-night spirals.
- Read more on sleep for further sleep content.
Most sleep advice is wrong or overstated. The above is what actually moves the needle.