Foods for deeper sleep after big

Melatonin is synthesised from serotonin, which is synthesised from tryptophan, an amino acid your body cannot produce and must get from food. Tryptophan is found in turkey, chicken, eggs, dairy products, oats, nuts and seeds. The conversion from tryptophan to serotonin to melatonin takes several hours, which is why the timing of protein-containing meals in the evening matters. Eating tryptophan-rich foods two to four hours before sleep gives your body the building blocks to produce melatonin at the point where your body clock system is ready to use it.

What is happening

Magnesium is involved in nervous-system signalling in the brain. GABA is your primary inhibitory neurotransmitter, the compound that quiets neural activity and allows your nervous system to shift from an alert state to a sleep-ready state. Low magnesium is associated with poorer sleep quality, more frequent waking and less time in deep sleep stages. Dark leafy greens, nuts, seeds and dark chocolate are the richest food sources. A meal containing these in the hours before sleep addresses the same mechanism that magnesium supplements target, with the added nutritional context of the whole food.

Glycine, an amino acid found in gelatine and bone broth, has shown consistent effects on sleep quality in small controlled studies. Three grams taken before sleep improved self-reported sleep quality and reduced daytime sleepiness in studies published in Sleep and Biological Psychiatry. The mechanism involves a slight reduction in core body temperature, which facilitates the transition into deep sleep. Gelatin-based foods, a small cup of bone broth, a gelatin-containing dessert, provide glycine without requiring supplementation.

What to do next

Tart cherry juice is one of the few foods with a natural melatonin content high enough to produce measurable effects on sleep duration and quality. Two small studies found that 240 millilitres of tart cherry juice twice daily for two weeks increased sleep time by an average of 84 minutes in adults with insomnia. The effect is modest and the research base is small, but it adds to a dietary approach to sleep rather than a supplement-first one. A small glass of tart cherry juice in the evening fits practically into most people's routines without requiring anything that feels like a protocol.

Sources: WHO healthy diet guidance, EUFIC healthy eating guidance, EFSA water guidance, WHO physical activity guidance.

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