2 question give or take a few sleep?

1) How many stages of sleep are within?
2) What occurs on respectively stage of sleep?
3) On what stage of sleep does dreaming occur?
If you can answer even 1 it would be apreciated.. 1) Usually sleepers intervene through five stages: 1, 2, 3, 4 and REM (rapid eye movement) sleep.

2) Stage 1 is light sleep where on earth you drift in and out of sleep and can be awakened glibly. In this stage, the eyes move slowly and muscle activity slows.
In stage 2, eye movement stops and brain top become slower with one and only an occasional burst of rapid brain breakers.
When a person enter stage 3, extremely slow brain waves call delta waves are interspersed beside smaller, faster waves.
In stage 4, the brain produces delta breakers almost exclusively. Stages 3 and 4 are referred to as deep sleep, and it is tremendously difficult to wake someone from them. In low sleep, there is no eye movement or muscle amusement.
In the REM period, breathing become more rapid, irregular and shallow, eyes push rapidly and appendage muscles are temporarily paralyzed. Brain waves during this stage increase to level experienced when a person is awake. Also, heart rate increases, blood pressure rises, males develop erections and the body loses some of the power to regulate its temperature. This is the time when most dreams come to pass, and, if awoken during REM sleep, a person can remember the dreams.

3) It occur in the REM (Rapid Eye Movement) cycle.
3 stages. and r.e.m sleep is when you are dreaming already. thats adjectives i remember.