Foods high in tryptophan, an amino acid that is a precursor to serotonin, can help people to fall asleep by reducing anxiety, relaxing the brain, and in regulating the sleep cycle.
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Areducing anxiety, relaxing the brain, and in regulating
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Bmeans of reducing anxiety, relaxing the brain, and in the regulation of
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Creducing anxiety, relaxing the brain, and regulation of
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Dreducing anxiety, relaxing the brain, and regulating
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Emeans of reducing anxiety, relaxing the brain, and regulating
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正确答案: D