💤 1. Why Do We Need to Sleep?

Every 每 night, we close our eyes and go to sleep. But why do we need to sleep?

Sleep helps our body rest 休息 and our brain recover 恢复 . When we sleep, our heart 心 slows down, our muscles 肌肉 relax 放松 , and our mind 头脑；心智；思想；介意 organizes 组织 what 什么 we learned during 在……期间 the day.

If we don’ t t sleep enough 足够的 , we feel tired, forget 忘记 things 东西 easily 容易地 , and can’ t t think 思考 clearly 清楚地 .

So 所以 , sleeping well is important for staying 停留 healthy 健康的 , happy, and smart 聪明的 !