EEG. These measurement show that the brain is not inactive during sleep. The brain, more than any other organ, undergoes a repair process during sleep.

Sleep consists of two fundamental states, REM and non-REM sleep, and each cause a distinct pattern of activity in the brain. During Non-REM sleep most of the muscles relax, body systems take a rest, and the brain waves associated with wakefulness and alertness disappear and are replaced by increasingly slow, deep waves of inactivity. In the REM stage of sleep, though muscles are totally relaxed, your eyes move back and for

Stage three and four are considered stages of deep sleep. In stage three extremely slow brain waves called delta waves begin to appear, interspersed with smaller faster waves. By stage four, the brain produces delta waves almost exclusively. During this stage you become very relaxed. Your have a slow regular heartbeat and respiratory rate. It is very difficult to be awakened during this stage. If you are awakened, you become confused and slow to react. It is usually easy to fall back asleep.

The phrase "sleeping your life away" seems to be less relevant. Studies and research prove the importance of sleep and the role it plays in our ability to live full, active and productive lives.

th quickly, your heartbeat increases, and blood flow to the brain is increased. This stage recurs about every ninety minutes throughout the night and each time it recurs we spend a little longer in this stage.

In normal sleeping patterns a person usually passes through five stages of sleep. It begins w

Some common words found in the essay are:
, sleep stage, brain waves, rem sleep, stage sleep, deep sleep, non-rem sleep, eye movement, sleep brain, deep sleep stage, stage characterized, sleep muscles,
Approximate Word count = 669
Approximate Pages = 3 (250 words per page double spaced)