Why do people need to sleep?

Question

You get all your energy from food right? And you can conserve energy by simply staying still for a while...

Why do you need to sleep and what does sleep do exactly?

Answer 1

i saw something about this the other day and it said scientist still dont know exactly why any living creature needs sleep but it's a necessity obviously

Answer 2

It's like a car battery.  You must be recharged to keep going!  Unless your car battery is charged it won't go, just like us. We have to have it.

Answer 3

Because we are in action everyday, our body gets tired, not our brain!

We need to sleep because during sleep the regeneration of the body is most effective. The brain does it`s best to regenerate the damaged cells that we got during a day. For example if you scratch yourself, the next day you wake up you see a big change in your scratch, it`s getting healed pretty fast, seriously have you ever tested that the cut, or scratch got better during a day? I bet you didn't! What brain mostly heals are the NEURONS! Neurons are like strings that communicate with our brain informing of what we are doing. (seeing, walking, touching...etc). Neurons get damaged pretty fast....the only time they are regenerated is during SLEEP!....Now I will give you a question! Have you ever heard noises that came out of now where and you thought they were real while others didn't hear them? :) Have you ever seen something that it was actually not there?:)! That`s called HALLUCINATION!!!! Hallucination happens when the NEURONS give wrong information to the brain because they are damaged and they need to be regenerated!!!! Hallucination is caused if you don't get much sleep, or if you don't sleep at all within 24 hours:)!!

So that`s why every living creature that has BRAIN HAS TO SLEEP and REGENERATE itself to start a new day of it`s LIFE!!!

Answer 4

I guess, you run you energy off all day and you need to regain it by sleep?

http://answers.yahoo.com/question/index;...

Answer 5

The brain needs sleep and the heart needs rest. It's a natural evolutionary thing among living things to rest and recharge. Even digesting food takes energy and sleep is also a way to repair tissues within the body.