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29 Apr 2022

How to sleep better and beat insomnia

Can't sleep? We ask the experts what works, and whether sleep aids are worth spending your money on

Struggling to get to sleep or sleep through the night? 

You're not alone - the National Institute for Health and Care Excellence (NICE) says that around one-third of adults experience sleep problems at least once a week, with up to one in ten permanently plagued by chronic insomnia (which is defined as difficulty getting to or staying asleep most nights for longer than four weeks).

Covid and its related worries hasn't exactly helped matters either. A 2021 review of studies showed that around 40% of people suffered from sleep problems during the pandemic.

We ask Professor Guy Leschziner, professor of neurology and sleep medicine at Guy's Hospital Sleep Disorders Centre, and author of The Secret World of Sleep, about the science behind getting a better kip.

Get the lowdown on free ways to improve your sleep habits, and if any sleep aids really work.

Tips for living well - get our free Food & Health newsletter: shop savvy, eat well, stay healthy

Why can't I sleep?

Many factors can hamper your ability to get a good night's sleep, and both biological and psychological influences are at play.

Professor Leschziner says: 'Daytime stress causes causes physical and psychological 'activation' or disruption which will make sleep more difficult or of a poorer quality.' 

Over time, positive conditioned responses (such as 'bed is a restful place') may get displaced by negative ones (such as 'bed is somewhere I now associate with not being able to sleep'), creating a vicious cycle.

6 tips to help you sleep better

In most instances, disturbed sleep can be helped by addressing 'sleep hygiene' and establishing good practices, such as:

1. Change poor sleep patterns: sleep less to sleep more

Professor Leschinzer says: 'It might sound counter-intuitive but depriving yourself of sleep can enable your brain to re-establish a proper sleep schedule.'

Note down how much time you actually spend asleep on a typical night - as opposed to tossing and turning - then allow yourself to sleep for this amount of time plus 30 minutes.

For example, if you are trying to sleep for eight hours but only managing five, spend five hours and 30 minutes in bed - based on the time you want to get up and altering your bedtime accordingly - and gradually increasing it once you're spending the majority of time in bed sleeping.

If you have a smartwatch or fitness tracker the sleep tracking function may help you understand aspects of your sleep, but Professor Leschziner suggests using them with caution as the information could be inaccurate and could even fuel your anxiety - causing further sleep issues.

How to track sleep on a smartwatch or fitness tracker - we explain how different brands track your sleep and what to look for

2.Get your bedroom temperature right

Our body temperature drops by a couple of degrees when we are sleeping to help conserve energy for vital functions such as breathing.

If it's too cold (under about 12°C) it can be difficult to drop off, and if it's too hot (24°C or more) this can lead to a restless sleep.

We typically sleep better when the room is cooler - ideally around 16-18°C.

A 2012 study reported in the Journal of Physiological Anthropology found that room temperature is one of the most important factors when it comes to achieving a good quality sleep.

A fan, air conditioner or heater can help you to help achieve a suitable bedroom temperature, but opening a window, or if its cold piling on the blankets, can also help. Bed socks can also make a big difference if you're feeling chilly.

For the best and least bothersome gadgets, see our guides to the best air conditioners, best electric fans and best cheap electric heaters.

3. Pick the right mattress - and pillow

A 2021 Italian Journal of Trauma and Orthopedics literature review on sleep quality and back pain found that a medium-firm mattress helps with sleep quality, comfort and keeping the spine in the best position.

The type matters too. When we surveyed Which? members about mattresses, those who have an open coil mattress were less likely to say it helps them get a good night's sleep than those with other types of mattress.

Lie for around five to ten minutes on several mattresses when you're trying them out, remembering to try turning on them to see how comfortable this is, too.

If you sleep with a partner, bear in mind any differences in weight and size between you both, as this affects what type of mattress will suit you best.

Choosing the right pillow can help, too - for example, a memory foam pillow is a great option for those looking for neck pain relief, as it contours to your body. See our pillow buying guide for more tips on choosing.

Best mattresses 2022: our top picks based on rigorous lab tests and expert choosing advice

4. Get outside in the morning, and off your phone at night

If you're not sleeping properly, exposing yourself to natural light in the morning can help reset your 'body clock' so you'll sleep more easily at bedtime.

Daylight in direct sunlight has up to 10,000 lux (bright office lighting is generally less than 500 lux) which is why daylight is so powerful at helping to reset the sleep-wake cycle.

Conversely, blue light emitted by many devices including smartphones and laptops has been found in multiple studies to contribute to poor sleep and excessive daytime sleepiness.

Stop using screens an hour before bedtime - even if they are in night mode, to avoid overstimulation preventing good sleep.

SAD lamps: do you really need one and how to buy the best

5. Take a warm bath or shower

A 2019 study published in the journal Sleep Medicine Reviews found that taking a warm bath or shower of 40-42.5 °C one to two hours before bedtime improved sleep quality and sleep efficiency (the time spent asleep when you're in bed), and reduced by an average of 10 minutes the amount of time it takes to drop off to sleep.

During the night our temperature drops and this aids better sleep, so although it sounds counter-intuitive, warming ourselves up by immersing ourselves in warm or hot water a little while before we go to bed actually helps to aid this natural drop.

The way it does this is by taking heat away from the body's core and to the hands and feet from where it is dispersed.

Best and worst bathroom brands - our unique survey reveals the brands consumers would recommend buying from, based on their experiences

6. Try a sleep app

If sleep hygiene doesn't seem to be helping, online self-help apps offering cognitive behavioural therapy for insomnia (CBT-I) can be an effective insomnia solution - and in some cases even better than face-to-face therapy.

Research carried out in 2020 by the Oxford Academic Health Science Network found that Sleepio - a six-week digital treatment for insomnia - helped those with insomnia gain almost six hours more sleep a week, as well as reducing sleeping pill use, time off sick and the number of GP visits.

CBT-I helps you to identify thoughts and behaviours that are causing your sleep problems and replace them with more constructive ones to promote healthy sleep through better habits.

Ask your GP about CBT-I as you may be able to get Sleepio or Sleepstation for free on the NHS - both are accredited by NICE.

How to access therapy and counselling services - tips on mental health help 

Do sleep aids such as lavender sprays, magnesium and melatonin work?

Sleep sprays

There is some research about the effectiveness of lavender essential oil in improving sleep quality, however, there aren’t any specific studies about pillow sprays, room mists, aromatherapy diffusers or roller-ball aromatherapy applications benefitting sleep.

Professor Leschziner says the benefit may come from involving them in a sleep ritual that helps you to prepare for a good night's sleep.


2021 research reported in the journal BMC Complementary Medicine and Therapies shows there is limited evidence to support magnesium supplements as a sleep aid and it's not robust enough to suggest any 'well-informed recommendations'. 

Professor Leschziner says: 'There is some suggestion that magnesium may help with sleep in people who have restless leg syndrome, but it's anecdotal evidence only.'

The same study also suggests that because oral magnesium is very cheap and widely available, adults with insomnia might like to try it (in quantities of less than 1g three times per day) to see if it helps.


This hormone plays a key role in regulating sleep and can be taken as a supplement, but it can't be bought over the counter in the UK. Some people may qualify for it on the NHS, though typically for short-term use - see NHS melatonin guide).

Professor Leschziner says: 'It's been demonstrated that melatonin can be helpful in terms of the time it takes to get to sleep and the quality of that sleep but the long term effects aren't fully understood.'


Cannabinoids like CBD have become trendy in the past few years and some people swear they can help you sleep.

However, Professor Leschziner says: 'The jury is still out on the long term consequences of it as an aid for sleep. There is more research to be done.'

A 2020 meta-study says that existing research into its use for insomnia is insufficient and further high-quality trials are needed before any conclusions can be drawn about their use for aiding a better night's sleep.

So, trying simple routine and sleep hygiene changes is likely to be the best place to start (and cheaper!).