Poor sleep is one of the most common reasons people start buying supplements, and it is also the area where the gap between what is sold and what is supported is at its widest. Before considering any product, it is worth being straight about the order of operations: the interventions with the strongest evidence behind them are behavioural, they are free, and they are unglamorous.
This is a practical checklist of those changes, drawn from the kind of advice the NHS gives rather than from anything we sell. Some of it will be familiar. The value is usually not in learning a new trick but in doing three or four of the familiar ones consistently for a fortnight, which almost nobody does.
Why the free changes come first
The behavioural approach to persistent sleep problems has a name — cognitive behavioural therapy for insomnia, usually shortened to CBT-I — and in UK clinical guidance it is the first-line approach for long-term insomnia rather than a preliminary before the real treatment. That ordering is not a matter of cost-saving. It reflects where the evidence is strongest and most durable.
Most of what follows is a simplified version of the same principles. None of it is exotic, and none of it works overnight; two weeks is a fair trial for most changes. Approaching it as an experiment you run on yourself, with one or two variables changed at a time, is far more informative than overhauling everything at once and being unable to tell what helped.
A consistent wake time does more than a consistent bedtime
Most people trying to fix their sleep start by setting an earlier bedtime, then lie awake in the dark feeling that they are failing at it. The body clock responds more reliably to when you get up and see light than to when you get into bed, and you can control the former with an alarm in a way you cannot control the latter.
So pick a wake time that works on a normal weekday and hold it, including at weekends. A lie-in of an hour is manageable; a lie-in of three hours on a Sunday shifts your clock in a way you then spend Monday and Tuesday recovering from, a pattern sometimes called social jetlag.
Long or late naps work against the same mechanism by reducing the sleep pressure that has built up during the day. If you nap, earlier and shorter is easier to get away with than late and long.
Light in the morning, less light at night
Light is the strongest signal your body clock receives. Getting outside reasonably soon after waking — even on a grey British morning, which is still far brighter than indoor lighting — helps anchor the timing of the whole day. This is one of the few sleep interventions that is genuinely easy and genuinely free.
In the evening the aim is the reverse. Dimming household lights for the last hour matters at least as much as what is on your phone screen, and it is often easier to change. If you are going to use a screen late, the content is worth a thought too: work email and news have an activating effect that has nothing to do with the wavelength of the light.
A dark bedroom helps. Blackout curtains or a well-fitting eye mask make a noticeable difference in summer, when it is light in Britain long before most alarms go off.
Caffeine has a longer tail than most people expect
Caffeine's half-life in adults is commonly cited at around five to six hours, and it varies considerably between individuals. A practical way to read that: a mug of coffee at four in the afternoon can leave a meaningful amount still circulating at ten in the evening.
People who insist caffeine does not affect them are sometimes right and sometimes describing tolerance to the alertness effect while the sleep disruption continues quietly. The only way to find out is to run the experiment: set a cut-off in the early afternoon, hold it for two weeks, and see what changes.
Coffee is not the only source. Tea, green tea, cola, energy drinks, some cold and flu remedies and pre-workout products all contribute, and dark chocolate contributes a little. Total the day rather than counting cups.
Alcohol, the sedative that fragments sleep
Alcohol is the most widely used sleep aid in the country and one of the least effective. It is genuinely sedative, so it shortens the time it takes to fall asleep, which is why the belief that it helps is so persistent. The problem arrives later in the night, as it is metabolised: sleep becomes lighter and more broken, and waking at three or four in the morning is a classic pattern.
You do not have to be drinking heavily to see this. A couple of glasses of wine in the evening is enough for many people to notice a difference in the second half of the night.
If you drink, the NHS publishes low-risk drinking guidelines and they are worth knowing. For sleep specifically, the useful experiment is a fortnight of alcohol-free evenings, or at least of finishing several hours before bed, and paying attention to how the small hours go.
Temperature, noise and the bedroom itself
Core body temperature falls as you fall asleep, and a bedroom that is too warm works against that. A cool room with adequate ventilation suits most people better than a warm one, and a warm bath or shower an hour or two before bed can help by encouraging heat loss afterwards.
Noise matters even when it does not wake you fully. Earplugs or a steady background sound can help in a noisy street or a shared house. So does the obvious: a mattress and pillow that suit you, and a bed that is used for sleep and sex rather than as an office, a dining table and a cinema.
That last point is the core of stimulus control. The more your brain associates the bed with being awake, working and worrying, the less reliably it associates it with sleep.
What to do when you cannot sleep
Lying in bed becoming increasingly annoyed about not sleeping is the one response that reliably makes things worse, because it strengthens exactly the association you are trying to break.
The standard advice, and it works better than it sounds, is to get up. Leave the bedroom if you can, keep the lights low, and do something quiet and undemanding — read a physical book, listen to something calm — until you feel sleepy, then go back. Repeat as often as necessary. It is tedious for the first few nights and it is the mechanism by which the association gets rebuilt.
Clock-watching adds nothing except arithmetic about how little sleep is left. Turn the clock away, and put the phone somewhere that requires standing up to reach.
If a racing mind is the obstacle, writing tomorrow's worries and tasks down before bed, on paper, gets them out of the loop of rehearsal.
When to stop self-managing and see a GP
Sleep hygiene is for ordinary poor sleep. It is not the answer to everything, and some patterns need proper assessment rather than a better bedtime routine.
- Difficulty sleeping most nights for more than three or four weeks.
- Sleep problems affecting your work, mood, relationships or safety, particularly if you drive.
- Loud snoring, gasping or pauses in breathing reported by someone else, or waking unrefreshed despite adequate hours — possible signs of sleep apnoea.
- Persistent low mood, anxiety, or thoughts of harming yourself.
- Pain, breathlessness, restless legs or a new medicine coinciding with the change.
None of these is a supplement question. The NHS has a page on insomnia and a self-referral route to talking therapies in England, and a GP can assess whether something else is driving it.
Where a supplement does and does not fit
We sell an evening formula, so it is worth being explicit about how we think it should be positioned. It is not a treatment for insomnia, it is not a sedative, and there is no authorised UK health claim for sleep attached to any of its botanical ingredients. Magnesium, the one nutrient in it with authorised claims, carries them for the nervous system, psychological function and the reduction of tiredness — not for sleep.
What a supplement can be is one part of an evening routine that you have already built properly. If the checklist above is genuinely in place and you want to try something alongside it, read the panel, check the cautions, and introduce it on its own so you can tell whether it made any difference.
If the checklist is not in place, a supplement is the least likely thing on the list to help, and we would rather say so than sell you something on a misunderstanding.
Frequently asked questions
How many hours of sleep do adults actually need?
Most adults need somewhere between seven and nine hours, and where you sit in that range is individual. The more useful measure than hours on a tracker is how you function during the day: consistently waking unrefreshed or struggling with daytime sleepiness is worth discussing with a GP regardless of what the numbers say.
Does magnesium help you sleep?
There is no authorised UK health claim linking magnesium to sleep, and we cannot make one. Magnesium does carry authorised claims for contributing to normal nervous system function, normal psychological function and the reduction of tiredness and fatigue. Those are claims about normal function in healthy people, and they are not the same thing as a sleep aid.
How long before bed should I stop drinking coffee?
Caffeine's half-life is commonly cited at around five to six hours and varies between people, so an early-afternoon cut-off is a sensible starting point to test. Remember that tea, cola, energy drinks and some over-the-counter remedies contribute as well, so it is the daily total and the timing of the last one that matter.
When should I see a GP about insomnia?
If poor sleep has continued most nights for more than three or four weeks, or it is affecting your daily functioning, mood or safety, book an appointment. Do the same if someone has noticed you snoring loudly, gasping or stopping breathing in your sleep. Long-term insomnia has effective non-drug treatment in the form of CBT-I, and it is worth being assessed properly.
Before choosing a supplement
- Read the complete current label, including the active and the other ingredients.
- Compare the daily serving rather than the number printed on the front of the bottle.
- Add up every source of the same nutrient across your whole routine.
- Ask a pharmacist or qualified healthcare professional about medicines, pregnancy, breastfeeding, surgery or an existing condition.
- Remember that food supplements do not replace a varied, balanced diet and a healthy lifestyle.
Related guides on this formula
- Ashwagandha, L-theanine and magnesium: reading an evening label
- Magnesium glycinate and other forms: how to read the label
View the Advanced Calm + Sleep label, the full ingredient panel and current purchase options.
Also useful: RevaHealth Journal · full range · Ingredients · Contact.
References and further reading
- NHS: Insomnia
- NHS Every Mind Matters: How to fall asleep faster and sleep better
- NHS: Alcohol units and low-risk drinking guidelines
This article is general educational information, not medical advice. Food supplements are not medicines and are not intended to diagnose, treat, cure or prevent disease. Always read the complete physical label before use, and speak to your GP or pharmacist if you are unsure whether a supplement is right for you.
