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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Her body's clock is out of sync with the sleep-wake rhythm most of the world lives by. She goes to bed each night between 5:30 and 7:30 p.m. and wakes in the wee hours of the morning.

她每天下午5点半至7点半的这段时间里就要上床睡觉，并且会在第2天凌晨的时候起床，和世界上绝大多数人的睡眠清醒节律都不相同。

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Little me gently in the night was ablaze with lights, and my finger in the light of faint luminescence rhythm.

小小的我，在那夜温柔的灯火辉煌之中，我的指尖在灯光的律动中隐隐发光。

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Feel the beat of the rhythm of the night.

FORBES: Dancing On The Ceiling Of The Trading Range

From my cosy cocoon, I heard the call and response of birds zipping electrically through the night air, the staccato rhythm of galloping hooves, the whoop of hyenas stalking fresh meat.

BBC: The Serengeti in the off-season

Of course, finding the rhythm in Vienna can also mean a quiet stroll through the Baroque streets at night, a meander along the banks of the Danube or just stirring a cup of coffee in a cafe.

BBC: Finding your rhythm in Vienna