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Certain bedtime snacks may help you sleep

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More than a third of American adults are not getting enough sleep, according to the Centers for Disease Control and Prevention.

You may want to try a bedtime snack that contains the amino acid tryptophan.

It's converted into two brain chemicals associated with sleep: melatonin, which helps regulate sleep cycles, and serotonin, which causes relaxation and drowsiness.

Foods that have high levels of tryptophan include egg whites, soybeans, low-fat cheese, chicken, and pumpkin and sesame seeds.

Foods that are high in carbohydrates, have lean protein and are low in fat may boost the production of serotonin and melatonin. Those include granola, unsweetened cereals or whole-grain crackers with milk.

If you're feeling fruity, pineapples, oranges and bananas may help up your melatonin levels.