How a Nutritionist Can Help You Sleep Better: Nutrition & Lifestyle
Updated: Sep 16
Sleep can be surprisingly difficult to improve.
You might know that you should have an earlier bedtime, spend less time on your phone and avoid caffeine in the evening, but sometimes it isn't that simple.
Our sleep is influenced by what happens throughout the whole day, not just the hour before bed.
As a Functional Nutritionist, I often look at the bigger picture when someone tells me they aren't sleeping well. Nutrition, caffeine, alcohol, stress, movement, light exposure, meal timing and daily routines can all be worth considering.
Here are some of the areas I would look at.
1. Look at your morning, not just your bedtime
One of the first things to consider is what happens when you wake up.
Our sleep-wake cycle is influenced by signals throughout the day, including light exposure and regular daily rhythms. Getting outside and seeing natural daylight in the morning can be a simple way of giving your body a strong daytime signal.
It can also be helpful to keep your wake time relatively consistent, rather than having a very different schedule at the weekend.
In other words, improving your sleep may start several hours before you ever get into bed.
2. Consider your caffeine intake
Caffeine is an obvious one, but it is easy to underestimate how long it can affect sleep.
Coffee isn't the only source. Tea, energy drinks, pre-workout products, cola and some supplements can also contribute to your total caffeine intake.
You don't necessarily need to give up caffeine completely. For some people, simply experimenting with when they have it can be useful.
If you're struggling with sleep, try paying attention to:
how much caffeine you have
what time you have your last caffeinated drink
whether your sleep changes when you move caffeine earlier in the day
3. Think about your evening meal
Food and sleep are closely connected, but there isn't one perfect dinner for everyone.
Some people find that going to bed after a very large or heavy meal is uncomfortable. Others may notice that going to bed very hungry doesn't work well for them either.
Rather than following a rigid “sleep diet”, I prefer to look at your individual pattern.
Consider:
When do you normally eat dinner?
How large is your evening meal?
Are you comfortably satisfied before bed, or very full or hungry?
Does your sleep seem different after certain types of meals?
These observations can help you work out what suits you personally.
4. Don't overlook alcohol
Alcohol can sometimes make you feel sleepy initially, which can create the impression that it helps you sleep.
However, alcohol can lead to lighter and more disrupted sleep and make nighttime waking more likely.
If you regularly have a drink in the evening and your sleep isn't great, it may be worth experimenting with reducing your intake and noticing what happens to your sleep quality.
5. Your stress doesn't disappear when you get into bed
One of the most common experiences I hear is:
“I'm exhausted, but my brain won't switch off.”
If you've spent the entire day working, looking after other people, answering messages and thinking about tomorrow, getting into bed doesn't necessarily mean your body immediately gets the message that the day is over.
Creating a transition between being busy and going to sleep can be helpful.
This might include:
finishing work at a defined time
dimming the lights in the evening
putting your phone away
having a shower or bath
reading
gentle stretching
breathing or relaxation exercises
writing down anything you need to remember for the following day
The aim isn't to create a perfect bedtime routine. It's to give yourself some space to slow down.
6. Get some movement during the day
Regular physical activity is another part of a healthy sleep routine.
You don't necessarily need an intense workout. Walking, strength training, cycling, swimming or other activities you enjoy can all contribute to an active day.
If you're currently very sedentary, increasing your overall movement may be more useful than searching for the perfect evening exercise routine.
7. Pay attention to light in the evening
Light is an important signal for our body clock.
In the evening, particularly in the period before bed, consider whether your environment is very bright and stimulating.
You might experiment with:
dimmer lighting
reducing unnecessary screen use
keeping your bedroom dark
avoiding working in bed
creating a calmer environment before sleep
Your bedroom itself matters too. A cool, quiet and dark environment can help create the conditions for sleep.
8. Don't try to change everything at once
This is probably the most important point.
When you're tired, being given a list of 20 things you need to change can feel overwhelming.
Instead, choose one or two things to experiment with.
For example:
This week: I'll keep my wake time more consistent and move my last coffee earlier.
Then pay attention to what happens.
How quickly do you fall asleep? How often do you wake? How do you feel in the morning?
Your sleep doesn't have to be perfect for you to learn something useful.
Start with the bigger picture
There isn't one single reason why someone might not be sleeping well, and there isn't one perfect sleep routine that works for everyone.
Instead of trying to follow every piece of sleep advice you come across, it can be more useful to look at your own patterns and identify the areas that may be worth changing.
Your nutrition, caffeine intake, meal timing, stress levels, movement, light exposure and evening routine can all provide useful clues.
Small, consistent changes can often be a much more realistic place to start than trying to completely overhaul your lifestyle overnight.
Frequently asked questions
How many hours before bed should I stop drinking coffee?
Further ahead than most people expect. In a controlled trial, 400 mg of caffeine taken six hours before bed still reduced total sleep time by more than an hour, and the people taking it largely did not notice the disruption themselves. If your sleep is fragile, a last caffeinated drink by early afternoon is a more realistic target than an evening cut-off. Caffeine's half-life varies widely between individuals, and is lengthened by pregnancy, some medications and the oral contraceptive pill.
Does alcohol help you sleep?
It helps you fall asleep and then damages the sleep that follows. Alcohol shortens the time taken to fall asleep and deepens sleep early in the night, but as it is metabolised it fragments the second half, suppresses REM sleep and makes waking more likely. This is why a drink can leave you asleep quickly and awake at four in the morning.
Why do I keep waking at 3am?
Waking in the second half of the night has several common explanations, and they often overlap: alcohol earlier in the evening, a rise in cortisol towards morning, unresolved stress producing night-time arousal, and simply having less sleep pressure left after the first half of the night. If it happens most nights, look at the whole day rather than the waking itself. Persistent early-morning waking alongside low mood is worth raising with your doctor.
What should I eat in the evening to sleep better?
There is no single sleep diet. What the research does show is that eating patterns and sleep patterns track together, and that both very large late meals and going to bed genuinely hungry tend to work against people. Aim to be comfortably satisfied rather than full, and keep your evening meal timing reasonably consistent. Which specific foods suit you is an individual question, and better answered by observing your own pattern than by following a list.
Does magnesium help you sleep?
The honest answer is that the evidence is thinner than the supplement marketing suggests. A systematic review of the available trials found the studies small, varied in quality and inconsistent in their results. Magnesium is worth considering if your intake is genuinely low or you have a reason to suspect deficiency, but it is not a reliable fix for disrupted sleep on its own, and it will not compensate for caffeine timing, alcohol or an unmanaged stress load. I have written in more detail about magnesium deficiency, testing and the different forms.
Does exercising in the evening ruin your sleep?
For most people, no. A meta-analysis of physical activity and sleep found that regular activity improves both how quickly people fall asleep and how well they sleep, and the effect of timing is much smaller than the effect of doing it at all. If you find that vigorous training late at night leaves you wired, move it earlier. If evening is the only time you will realistically exercise, keep exercising in the evening.
How long does it take to improve your sleep?
Think in weeks, not nights. Sleep responds to patterns rather than to single days, and the regularity of your sleep and wake times matters as much as their timing. Change one or two things, hold them for two to three weeks, and judge the effect on how you feel across the whole period rather than on any individual night.
When should I get my sleep medically investigated?
Speak to your doctor rather than adjusting your routine if you have any of the following: loud snoring, or a partner who has seen you stop breathing or gasp in your sleep; waking unrefreshed despite consistently spending enough hours in bed; falling asleep during the day when you do not intend to; an uncomfortable urge to move your legs that stops you settling; or sleep that has changed suddenly alongside low mood, weight change or palpitations. Sleep apnoea, thyroid disease, restless legs syndrome and depression all present as poor sleep, and none of them is solved by nutrition and lifestyle alone.
How I can help
If you're struggling with your sleep, we can look at the bigger picture together.
With me, you get a personalised approach that looks at the whole picture, not just your bedtime routine.
I'll look at your nutrition, lifestyle, daily habits and individual nutritional needs to understand what may be affecting your sleep and what your body needs to support better sleep.
This includes personalised recommendations around food, nutrition and targeted food supplements, so you have the nutritional support your body needs alongside practical lifestyle changes.
Together, we'll create a clear and realistic plan tailored to you, so you know what to change, what to eat and what nutritional support to take, rather than trying to work it all out yourself.
If you'd like to explore this further, you can book a personalised nutrition consultation with me.
Scientific references
Wright KP, McHill AW, Birks BR, et al. (2013). Entrainment of the human circadian clock to the natural light-dark cycle. Current Biology, 23(16), 1554-1558. https://doi.org/10.1016/j.cub.2013.06.039
Phillips AJK, Clerx WM, O'Brien CS, et al. (2017). Irregular sleep/wake patterns are associated with poorer academic performance and delayed circadian and sleep/wake timing. Scientific Reports, 7, 3216. https://doi.org/10.1038/s41598-017-03171-4
Drake C, Roehrs T, Shambroom J, Roth T. (2013). Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. Journal of Clinical Sleep Medicine, 9(11), 1195-1200. https://doi.org/10.5664/jcsm.3170
Crispim CA, Zimberg IZ, dos Reis BG, et al. (2011). Relationship between food intake and sleep pattern in healthy individuals. Journal of Clinical Sleep Medicine, 7(6), 659-664. https://doi.org/10.5664/jcsm.1476
Ebrahim IO, Shapiro CM, Williams AJ, Fenwick PB. (2013). Alcohol and sleep I: effects on normal sleep. Alcoholism: Clinical and Experimental Research, 37(4). https://doi.org/10.1111/acer.12006
Akerstedt T. (2006). Psychosocial stress and impaired sleep. Scandinavian Journal of Work, Environment & Health, 32(6), 493-501. https://doi.org/10.5271/sjweh.1054
Kredlow MA, Capozzoli MC, Hearon BA, et al. (2015). The effects of physical activity on sleep: a meta-analytic review. Journal of Behavioral Medicine, 38(3), 427-449. https://doi.org/10.1007/s10865-015-9617-6
Gooley JJ, Chamberlain K, Smith KA, et al. (2011). Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans. The Journal of Clinical Endocrinology & Metabolism, 96(3), E463-E472. https://doi.org/10.1210/jc.2010-2098
Arab A, Rafie N, Amani R, Shirani F. (2022). The role of magnesium in sleep health: a systematic review of available literature. Biological Trace Element Research, 201(1), 121-128. https://doi.org/10.1007/s12011-022-03162-1
Hirshkowitz M, Whiton K, Albert SM, et al. (2015). National Sleep Foundation's sleep time duration recommendations: methodology and results summary. Sleep Health, 1(1), 40-43. https://doi.org/10.1016/j.sleh.2014.12.010
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