Jet lag happens when your circadian rhythm is running on a different day-night cycle than the day-night cycle of the outside world.

当我们的生物钟周期与外部的昼夜交替周期不一致时，我们就有倒时差的感觉。

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The moths fly with a clear day-night rhythm.

飞翔活动有明显的昼夜节律。

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Conclusion the outbreak of angina pectoris in the CHD patients has obvious day and night rhythm.

结论冠心病患者的心绞痛发作有明显的昼夜分布节律。

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"Exercise is known to help with sleep if you don't do it just before bedtime, " possibly because it promotes overall good health and helps enhance the body's circadian rhythm, which promotes activity during the day and resting at night, says Rapoport.

CNN: Exercise plus sleep may lower cancer risk in women