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Answer by Morfeous
There are two main types of sleep:
Non-REM (NREM) sleep consists of four stages of sleep, each deeper than the last.
REM (Rapid Eye Movement) sleep is when you do most active dreaming. Your eyes actually move back and forth during this stage, which is why it is called Rapid Eye Movement sleep.
Stage 1 (Transition to sleep) – Stage 1 lasts about five minutes. Eyes move slowly under the eyelids, muscle activity slows down, and you are easily awakened.
Stage 2 (Light sleep) – This is the first stage of true sleep, lasting from 10 to 25 minutes. Eye movement stops, heart rate slows, and body temperature decreases.
Stage 3 (Deep sleep) – You’re difficult to awaken, and if you are awakened, you do not adjust immediately and often feel groggy and disoriented for several minutes.
Stage 4 (More intense deep sleep) – The deepest stage of sleep. Brain waves are extremely slow. Blood flow is directed away from the brain and towards the muscles, restoring physical energy.
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