explanation of the sleep cycle and dreaming

Sleep cycle and Dreams
Even though sleep is often described as a state of rest, our brain is far from resting during our sleep. In the state of sleep, our brain experiences another level of activity while the body tends to slump into a dormant state.
Our sleep is not unregulated. Sleep follows a studied cycle in a pattern that repeats itself several times at night. This is known as sleep cycle. Typically, the sleep cycle comprises two types of sleep- non-REM sleep and REM sleep. These types are divided into stages.
When a person sleeps, he enters the first stage of non-REM sleep that lasts but a few minutes. It...