Nutrition plays a big part in sleep. More fruits and vegetables, legumes, grains, fish in the diet helps sleep by supplying melatonin. Increases supply of the essential amino acid tryptophan. This includes dairy foods. Tryptophan is a precursor of serotonin which converts into melatonin. This needs to be eaten with high fibre diet as a legume or grain so it is digested properly. Lower inflammation levels improve sleep quality and plant based foods lower inflammation. High fibre helps as a healthy gut is beneficial for sleep.
Consistent eating times, separation between day and night so that the biggest calories are taken earlier in the day with a good breakfast in the bright daylight hours, and the night meal taken early a few hours before sleep. This sends signals that the body is winding down to sleep and get the body ready to sleep.