睡眠专家也指出人昼夜周期中，即使是很小的变动，也会随着周期的不断推移而扩大。
Also, sleep scientists know that even a small variation in people's circadian cycles gets amplified by such factors as when in their cycle light strikes the eye.
核桃含有褪黑激素——一种能调节昼夜周期节律的神经激素，能帮助你得到应对白天活动所需的休息。
Walnuts are rich in melatonin, a neurohormone which regulates the circadian rhythm of your sleep-wake cycle and helps you to get the rest you need to face the day.
这种以近似于——但不完全是——一天为周期的节律，叫做昼夜节律。
Such a rhythm whose period is approximately—but not exactly—a day is called circadian.
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