Part one of term paper
As fundamental as drinking or eating, sleeping can be described as a certain necessity that all animals need. Although it can not be proven beyond the shadow of a doubt what the evolutionary advantages are, there have been many studies that show what happens if we do not sleep. These slight changes in behavior can be very debilitating. Som ...

Part two of term paper
... known as stage four. These stages are all during the time known as Non-REM sleep, or Non-Rapid Eye Movement sleep. The first stage is a very light sleep with relaxed muscles. The second is characterized by brain waves getting larger. The third and fourth stages are where the sleeper is in a deep sleep in which their brain waves are huge and slow which makes this stage the hardest to wake from. After an hour or so, you shift into a highly active stage characterized by rapid eye movements, henc ...