Text 1 After a busy day of work and play, the body needs to rest
Sleep is necessary for good health
During this time, the body recovers from the activities of the previous day
The rest that you get while sleeping enables your body to prepare itself for the next day
There are four levels of sleep, each being a little deeper than the one before
As you sleep, your muscles relax little by little
Your heart beats more slowly, and your brain slows down
After you reach the fourth level, your body shifts back and forth from one level of sleep to the other
Although your mind slows down, from time to time you will dream
Scientists who study sleep state that when dreaming occurs, your eyeballs begin to move more quickly (Although your eyelids are closed)
This stage of sleep is called REM, w