You gain weight 体重上升

Dr. Shah says two specific hormones that regulate eating behavior are affected. "Ghrelin, which increases appetite, is high in people with sleep deprivation," he says. "On other hand, levels of leptin, which lowers appetite, has been found to be low in sleep-deprived people."

Shah医生说有两种荷尔蒙会影响饮食习惯。“胃饥饿素（一种肠道激素）会让人胃口大开，在人们睡觉的时候达到峰值。”还有一种与其相反作用的，瘦素，会让人食欲低下，在睡眠不足的人身上很难找到。

One study showed those who were sleep deprived consumed 300 more calories a day than those who were well-rested. You also may gain weight because your metabolism slows down in order to conserve energy when you're tired.

比起正常睡眠的人，睡眠不足的人要多消耗300卡路里一天。当觉得疲劳的时候，你的新陈代谢系统减慢会帮助你存储能量，也就导致你增重。

You have no energy for exercise 无力锻炼

Skimping on sleep will almost definitely lead to less motivation for working out. "You're going to exercise less if you're constantly tired," Dr. Bazil says.

睡不足还会让你缺乏锻炼的动力，如果你一直觉得很累，那么去锻炼的数量也会减少。”Bazil医生如是说。

And if you do exercise, your athletic performance may suffer due to a slower reaction time and less energy, as a study of college basketball players showed.

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