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The research reveals how dietary tryptophan -- an amino acid found mostly in animal products, nuts, seeds, whole grains and legumes -- can be broken down by gut bacteria into small molecules called metabolites.

Many people think of tryptophan as the ingredient in turkey that supposedly makes us sleepy after a Thanksgiving feast.

When the nutrient solution is irradiated with plasma, the electrons of the plasma generate oxygen radicals, highly unstable oxygen particles, that then produce tryptophan radicals.

Milk can be especially beneficial for sleep, as it contains the amino acid tryptophan, which can promote melatonin production.

Fiber-rich foods like beans and oatmeal and certain protein sources – especially those that are high in the amino acid tryptophan, such as poultry – are also associated with higher-quality sleep.