Why Do We Need Sleep?

A question Ive always wondered about myself OP.

Its also the most time-wasting most irritating thing in life. I wish we didnt need it..but we do :( Such a waste of our lives lying there like a goat motionless.

Arent there some creatures that never sleep...is it sharks? Or can they sleep while swimming? I think they cant stop swimming or they croak (no fresh O2 water over gills).
 
I love sleepytime. It's the only time I can be an eagle soaring above the mountains and the only situation in which I will ever play like Liszt. Don't knock it!
 
Tide - The moons gravity pulls on the oceans (also the suns gravity, but not as much)
seasons - the earth is tilted a bit so as we orbit the sun either the northern or southern hemisphere is pointed at it.

Why do we need gravity, the moon, the sun and the northern and southern hemispheres though?
 
We sleep because it's awesome!

Also, it's the ideal time for our brains to do some filing, let our bodies recover and fix itself. It can't really do that whilst we're awake as it's too busy using all our senses to help us do the activities that we're doing - which is why it needs us to lose consciousness or at least only have our deep subconscious active. Makes sense to me really.
 
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