Sleep Hygiene: how to sleep better

Everyone understands that relaxed, refreshed feeling after a long, deep night of sleep. When your sleep cycle is regularly disturbed, that feeling can seem almost out of reach. Poor sleep affects far more than your mood. It affects concentration, decision-making, physical recovery, and long-term health. Sleep hygiene is the term used for the daily habits and routines that set you up for consistently good sleep. Think of it as a toolkit you build around yourself, covering everything from what you eat and drink during the day to the environment you sleep in at night.

This guide covers the full picture: what sleep hygiene actually means, how much sleep adults actually need, the habits that make the biggest difference, and why your sleeping environment, including your mattress, matters more than most people give it credit for.

1. What is sleep hygiene?
2. How much sleep do adults need?
3. Sleep hygiene tips: how to sleep better at night
4. Keep a consistent sleep schedule
5. Your bedroom environment matters
6. Caffeine, alcohol, nicotine and what you eat
7. Warm drinks before bed
8. Screens, blue light and natural light
9. Building a wind-down routine
10. Exercise and sleep
11. Is your mattress affecting your sleep?
12. When sleep hygiene is not enough
13. Summary

What is sleep hygiene?

Sleep hygiene is a term used to describe the collection of habits, routines and environmental conditions that support a good night’s sleep. It covers what you do during the day as much as what you do in the hour before bed. The NHS, the Sleep Charity and sleep medicine specialists all broadly agree on the same core principles, because the underlying science is consistent: your body runs on an internal clock called the circadian rhythm, and sleep hygiene is largely about keeping that clock well-calibrated.

The term sometimes gets dismissed as obvious advice, but the reality is that most adults are consistently breaking at least two or three of the core rules without realising it, and those small daily habits compound over time into genuine sleep debt and fatigue.

Sleep hygiene will not cure clinical insomnia or sleep disorders. If your sleep problems are severe and persistent, your GP is the right starting point. But for the majority of people experiencing poor quality sleep, disrupted nights or difficulty switching off, improving sleep hygiene is the single most effective change you can make without any medical intervention.

How much sleep do adults need?

Before working on the habits that shape your sleep, it helps to understand what you are aiming for. Most adults need between seven and nine hours of sleep per night, and this figure is consistent across the NHS, the National Sleep Foundation, and the American Academy of Sleep Medicine. The right amount for you personally will sit somewhere in that range and is largely determined by genetics rather than lifestyle.

A useful rule of thumb: if you regularly wake up feeling rested without an alarm, and you do not feel drowsy during the day, you are getting enough sleep. If you rely heavily on an alarm, feel foggy in the morning, or find yourself struggling to concentrate by mid-afternoon, you probably are not. These signals matter because the habits below are only worthwhile if you are also giving yourself enough time in bed for sleep to actually occur.

Sleep hygiene tips: how to sleep better at night

The tips below are grounded in current sleep science guidance and reflect the guidelines recommended by Professor Jason Ellis of Northumbria University, published by the Sleep Charity as the definitive UK best-practice framework. None of them require any special equipment or significant lifestyle overhaul. They do require consistency, because that is the key word in sleep hygiene. A single good night is not the goal. A reliable pattern of good nights is.

1. Keep a consistent sleep schedule

This is the single most important principle in sleep hygiene. Going to bed and waking up at the same time every day, including weekends, reinforces your circadian rhythm. Your body learns to expect sleep at a certain time and begins preparing for it in advance, releasing melatonin and reducing core body temperature in anticipation.

When your schedule shifts around, the body’s internal clock falls out of sync. This is exactly what causes that groggy, jet-lagged feeling after a weekend of late nights, even if you technically slept for eight hours.

The most important anchor is your wake-up time. Fix it and keep it consistent. Your sleep onset will gradually stabilise around it. If you find yourself unable to fall asleep within about twenty minutes of going to bed, get up rather than lying there becoming increasingly frustrated. Do something calm in low light and return to bed when you feel genuinely tired. Frustration in bed creates a negative association that makes the problem worse over time.

It also helps to hide or turn your clock away from view during the night. Watching the minutes pass when you cannot sleep raises anxiety and cortisol levels, which makes sleep harder to achieve. Removing the temptation to check the time is a small change that consistently helps light sleepers.

2. Your bedroom environment matters

Temperature regulation is one of the most underestimated factors in sleep quality. Your core body temperature naturally drops as you move towards sleep, and a bedroom that is too warm interferes with this process. Most sleep specialists recommend keeping the bedroom cooler than the rest of the house, somewhere between 16 and 18 degrees Celsius for most adults.

Darkness is equally important. Even low levels of ambient light can suppress melatonin production. Blackout blinds or curtains make a meaningful difference, particularly during summer months when early mornings are light well before most people need to wake up.

Noise disruption is the third factor. For light sleepers in noisy environments, earplugs are a practical, inexpensive solution. Some people also find that consistent background sound, such as a fan or a white noise machine, reduces the impact of unpredictable noise by masking it.

Your bedroom should be associated with sleep, and sleep only. The brain builds stimulus-response associations through repetition. When you work in bed, watch television in bed, or scroll on your phone under the covers, you teach your brain that bed is a place of activity and alertness. Over time, simply getting into bed stops triggering the drowsiness response because the association has been diluted. Keeping the bedroom for sleep means that getting in becomes a reliable signal that sleep is coming, and the body responds accordingly.

3. Caffeine, alcohol and nicotine

Caffeine

Caffeine has a half-life of roughly five to six hours in most adults, and some people metabolise it more slowly than that. As a practical guideline, the Sleep Charity recommends cutting off caffeine around six to eight hours before your intended bedtime. For most people going to bed at 10 or 11pm, that means stopping after 2pm or 3pm at the latest. Remember that caffeine is not limited to coffee: tea, cola, energy drinks and even dark chocolate all contain meaningful amounts that accumulate across the day.

Alcohol

Alcohol is a sedative and many people feel it helps them fall asleep. The problem is what happens a few hours later. As alcohol is metabolised, it becomes a stimulant, causing lighter, more fragmented sleep in the second half of the night. It also suppresses REM sleep, the stage most associated with emotional processing and memory consolidation. Regular evening drinking consistently reduces sleep quality even when it does not appear to cause obvious waking.

Nicotine

Nicotine is a stimulant and its effects on sleep are often overlooked because they are less visible than those of caffeine or alcohol. Smoking close to bedtime raises heart rate and alertness and makes falling asleep harder. People who smoke also tend to experience lighter sleep overall and are more likely to wake during the night as nicotine levels drop and mild withdrawal begins. Avoiding nicotine in the two hours before bed, and during any night waking, reduces this disruption.

Food and timing

Eating a heavy meal within two to three hours of bedtime forces your digestive system to keep working when your body is trying to wind down. This can cause discomfort, indigestion and disrupted sleep. Equally, going to bed hungry can cause waking during the night. The balance to aim for is satisfied but not full. If you are prone to night waking and are eating late, adjusting your evening meal time is one of the quickest changes you can make.

4. Warm drinks before bed

A warm, non-caffeinated drink in the wind-down period before bed is genuinely useful, and the science behind it is straightforward. Drinking something warm raises your core body temperature slightly, and as your body then dissipates that heat, your temperature drops, which is one of the physiological signals that triggers drowsiness. Warm milk works particularly well because milk contains tryptophan, an amino acid that the body converts to serotonin and eventually melatonin, the hormone that regulates sleep.

Herbal teas such as chamomile, valerian root and passionflower are also commonly used and have mild relaxing properties, though the evidence for these is less robust than for the temperature effect of the warm drink itself. The important distinction is what to avoid: hot chocolate and some herbal tea blends can contain caffeine or theobromine, both of which are stimulants. If you enjoy hot chocolate before bed, it is worth knowing that cocoa contains theobromine, which is a milder stimulant than caffeine but can still delay sleep onset in sensitive individuals.

We have a full guide to whether hot chocolate before bed helps or hinders sleep if you want to explore this in more detail.