现代人由于工作或职业的原因，都有过昼夜颠倒的时候。昼夜节律颠倒对人体的生理功能和代谢都会产生一定的负面影响。
在正常情况下，人体在白天与夜间的生理节律有明显的不同。白天主要以交感神经活动和物质代谢的分解过程为主，而夜间则以副交感神经活动和物质代谢的合成过程为主。生物化学的观察结果也证明，不同酶的活性和内分泌激素的代谢在昼夜间也有很大的差别。
熬夜须知
1、熬夜时要吃热的东西(如热方便面)。
2、晚饭不能吃太饱。
3、注意保暖，不要冻着肚子。
4、一定要有足够多的白开水。
5、熬夜无论多累中间不可上床休息。
6、若乏困可喝咖啡或茶水之类的刺激性饮品来提神，但要注意应饮热的，浓度不要太高，以免伤胃。
7、熬夜时，应时时做深长呼吸。
8、至少要熬到天亮，即凌晨5点左右，并不断的想象太阳升起时的辉煌和气势。
9、早饭一定要吃饱，一定不要吃凉的食物。
10、凌晨7、8点钟，若要睡觉，一定要收心，即使不上床睡觉，也要坐在椅子上收心。
熬夜最佳作息表
有的人喜欢熬夜，但其结果往往是把自己搞的精疲力尽，效率低下，长久下去还会伤害身体。其实，科学的、间断性的熬夜有时会使某些类型的人获得意想不到的效果。熬夜后，在凌晨4、5点钟入睡，熬了一整夜，你一定感到很累，所以睡觉时会睡得特别香、特别沉，你会休息得特别好。熬夜可以使你集中较长的时间，专攻一项难度较大的工作。
执行本作息表的先决条件是你晚上9、10点钟时感到精力过剩，根本不想睡觉。一般人轻易不要用本作息表。
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