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Walnuts contain several nutrients that promote good sleep, such as melatonin, serotonin, and magnesium. Studies show that eating walnuts increases melatonin in the blood, making walnuts a great bedtime snack, walnuts are also high in omega-3 fatty acids. Animal studies in rats have shown that omega-3 fatty acid deficiency can alter several neurotransmitter pathways, including that of serotonin, affecting depression, anxiety, and sleep.