Sleep: Brain Functions

The brain's still working while asleep. People and animals can die without sleep for a long time. Average person spends 7-8 hrs (1/3 of their life) sleeping. Brain sends electrical waves for person to enter sleep and dreams to happen. Brainwaves increase as the person progresses through sleep, but move very slowly. Sleep walking occurs during deep sleep. Rapid Eye Movement (REM) occurs when deep sleep waves go back to stage 1 waves, but the person is not awake yet. This is when a person moves his/her eyes while closing them like following a scene (in a dream). Most people move/toss while they're asleep, to loosen up muscles.