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There are many different theories as to why we sleep, but it is known that after a certain amount of time all humans will die without any sleep at all. The most important phase of a sleep cycle is called Rapid Eye Moment (REM) sleep. This is when we are very deeply asleep, and when most dreaming occurs. Many scientists believe sleep to the brain's way of 'filing' all the thoughts and sensations of the day, storing the one's we'll need again, and deleting the one's we won't. When we don't sleep for as long as our bodies expect us to, the brain makes up for this by making us sleep more deeply and for longer the next time as a means of compensation.

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16y ago

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