1. "NREM sleep is divided into four stages, the last of which is the deep, restorative, quiet sleep commonly associated with "a good night's rest.

2. Think of it this way: In NREM sleep, your brain isn't very active, but your body is.

3. NREM sleep is when you tend to toss and turn in bed. Your brain quiets down, which means that you aren't dreaming.

4. NREM sleep is also when your body repairs itself and releases hormones, including growth hormones.

5. During the day, your brain is a beehive of activity -- during NREM sleep it is barely humming.

6. Conclusion Female patients are older than male but not more adipose. SAHS and respiratory events during NREM sleep are less severe in women.

7. The value of correlation dimension can reflect sleep stages after analyzing and simulating the sleep EEG, and then simulation forecast for NREM sleep stage was made which accorded with actual result.