While no single food will cure poor sleep, specific dietary choices in the hours before bed create nutritional conditions that either support or undermine the physiological processes required for good sleep. Understanding which foods and nutrients are most beneficial — and the specific mechanisms through which they work — allows you to make deliberate evening eating choices that support better rest.
Tryptophan-Rich Foods: The Serotonin-Melatonin Pathway
Melatonin — the primary sleep hormone — is synthesised from serotonin, which is in turn synthesised from the amino acid tryptophan. Consuming tryptophan-rich foods in the evening, ideally alongside a moderate carbohydrate that stimulates insulin (which clears competing amino acids from the bloodstream and improves tryptophan's brain transport), supports this pathway. The best tryptophan sources: turkey (highest concentration), chicken, eggs, dairy products (warm milk's sleep-promoting reputation has genuine physiological basis), pumpkin seeds, tofu, oats, and bananas. The British Nutrition Foundation acknowledges the dietary tryptophan-melatonin pathway in its sleep nutrition guidance.
Tart Cherry: The Strongest Food-Based Sleep Evidence
Tart cherry (Montmorency cherries) is one of the few concentrated dietary sources of melatonin. Two randomised controlled trials demonstrated significant improvements in sleep duration (by 25–30 minutes) and sleep quality in adults consuming 30ml of tart cherry concentrate twice daily. A third trial found benefits specifically in insomnia patients. Tart cherry juice is available in health food stores; the concentrate provides a more practical dose than whole cherries. This is the single most evidence-supported dietary intervention for sleep improvement beyond caffeine avoidance. The NHS encourages evidence-based self-management approaches for mild sleep difficulties.
Magnesium for Relaxation and Sleep Onset
Magnesium activates GABA (gamma-aminobutyric acid) receptors — the inhibitory neurotransmitter system that reduces neural excitation and promotes relaxation and sleep. Magnesium also directly regulates melatonin synthesis. Deficiency — common among UK adults — is associated with insomnia, restless sleep, and difficulty relaxing before bed. Evening foods rich in magnesium: dark chocolate (70%+ cacao), pumpkin seeds, almonds, leafy greens cooked at dinner, and whole grains. Magnesium glycinate supplementation (200–400mg before bed) has clinical evidence for improving sleep quality in those with deficiency.
Glycine for Deep Sleep
Glycine, an amino acid found in bone broth, gelatin, and collagen-rich foods, has emerging evidence for improving sleep quality and reducing daytime fatigue. A 2012 Japanese RCT found that 3g glycine before bed significantly improved subjective sleep quality and reduced next-day fatigue. Glycine appears to lower core body temperature (facilitating sleep onset) and improve slow-wave sleep architecture. Evening bone broth — practical, warming, and glycine-rich — is a evidence-supported evening food choice with additional gut health benefits.
Foods to Avoid in the Evening
High-sugar foods and refined carbohydrates consumed in the evening cause blood glucose fluctuations that produce nocturnal awakenings. Alcohol impairs sleep architecture in the second half of the night. Large, high-fat meals within 3 hours of sleep elevate core body temperature and increase acid reflux risk. Spicy foods worsen reflux and increase core temperature — both impair sleep onset. The practical evening eating approach: a moderate, balanced meal with protein, complex carbohydrates, and vegetables at least 3 hours before sleep, followed optionally by a small tryptophan-containing snack 30–60 minutes before bed.
Daily Nutrition That Supports Your Energy and Sleep
The nutritional principles in this article are best applied through consistent daily habits. For City of London professionals, the quality of the daily work lunch is one of the most controllable variables for sustained energy and sleep quality. Vanda's Kitchen near St Paul's EC4 delivers certified halal, 100% nut-free, freshly prepared food built around lean proteins, complex carbohydrates and fresh vegetables — the nutritional foundation for stable blood sugar, sustained energy and healthy sleep. View our team lunch options or WhatsApp us about office delivery.
For related reading, see our insomnia and diet guide and our magnesium deficiency guide.
Fuel Your Day With Vanda's Kitchen
Applying the nutritional principles in this article consistently is easier when the daily work lunch is sorted. Vanda's Kitchen near St Paul's EC4 delivers certified halal, 100% nut-free, freshly prepared food to City of London offices — lean proteins, complex carbohydrates and fresh vegetables prepared daily to Selfridges Food Hall standards. The nutritional composition that supports stable energy, healthy sleep and metabolic function, delivered to your desk. View our team lunch options or WhatsApp us.
Frequently asked questions
How much tart cherry juice is needed to improve sleep, and how long does it take to work?
The randomised controlled trials demonstrating sleep benefits used 30ml of tart cherry concentrate twice daily — once in the morning and once in the evening. Benefits including increased sleep duration and improved sleep quality were observed within one to two weeks of consistent daily use. The concentrate form is more practical than whole cherries for achieving the effective dose.
Does warm milk genuinely help sleep, or is this just a myth?
There is genuine physiology behind warm milk's sleep-promoting reputation. Milk is one of the richer dietary sources of tryptophan, the amino acid from which serotonin and ultimately melatonin are synthesised. The warmth also raises core body temperature slightly, and the subsequent cooling facilitates sleep onset. The effect is modest but real, particularly as part of a consistent bedtime routine.
Does alcohol help or harm sleep?
Alcohol may assist sleep onset but consistently impairs sleep architecture in the second half of the night, reducing restorative slow-wave sleep and REM sleep. This produces the characteristic broken, unrefreshing sleep after drinking. The net effect on sleep quality is negative, and regular evening alcohol use is associated with chronic sleep disruption and worsening insomnia symptoms over time.
What is the mechanism by which magnesium improves sleep?
Magnesium activates GABA receptors — the inhibitory neurotransmitter system that reduces neural excitation and promotes the relaxed state required for sleep onset. It also directly regulates melatonin synthesis. Deficiency, which is common in UK adults, is associated with insomnia and restless sleep. Magnesium glycinate taken in the evening has clinical evidence for improving sleep quality in those with deficiency.
What is glycine, and is it worth including in an evening meal for sleep?
Glycine is an amino acid found in bone broth, gelatin, and collagen-rich foods. A 2012 Japanese randomised controlled trial found that 3g of glycine before bed significantly improved subjective sleep quality and reduced next-day fatigue. Its mechanism appears to involve lowering core body temperature — which facilitates sleep onset — and improving slow-wave sleep architecture. Evening bone broth is a practical food source.