第1个回答 2013-11-30
There is no living creature that doesn't need sleep or complete rest every day.
If you want to know more,,just go without sleep for a period of time! You would find it hard to focus on your work.So everyone knows the importance of sleep.
One of the things that we all know about sleep is that we are unconscious in sleep. we don't know what's going on around us. But that doesn't mean the body stops all activities. The vital organs go on working during sleep,but most of the body functions slow down.
Your body temperature becomes lower when you are asleep,so people always go to sleep under some kind of covers.And even though you are unconscious,many of you reflexes still work.For example, if someone touches your foot, you will pull it away in your sleep or even brush a fly from your face.You do these things without knowing it.