人为什么要睡觉?睡眠是一种正常的生理反应,是大脑神经活动的一部分。睡觉时,四肢停止了运动,全身肌肉放松,心跳减慢,呼吸深而长,全身都能够得到充分的放松和休息,只有睡眠充足才能保证第二天精力充沛。有人把它不适当地比喻为汽车的保养或 Why do people want to sleep? Sleep is a normal physiological reaction, is part of the brain’s neural activity. Sleep, the limbs stopped the movement, the body muscles relax, slow heartbeat, breathing deep and long, the whole body can be fully relaxed and rest, only enough sleep to ensure the next day energetic. Some people compare it improperly to car maintenance or