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Dinner: Jasmine Rice
A small study in the American Journal of Clinical Nutrition found that when subjects' dinner consisted mainly of jasmine rice—a food high on the glycemic index—they fell asleep roughly twice as fast as those whose meal included rice low on the index. High GI foods can trigger the release of the sleep-promoting amino acid tryptophan. The index ranks how much carb-containing foods raise blood sugar. The lower a food is on the scale, the less its effect.

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