1. The Science of Dreaming
... . Once we're finished with REM sleep, we begin to descend back down through all four stages until we are at back at light sleep. Once there, we begin to ascend back through the four stages again. We repeat this cycle many times throughout the night, with each cycle taking approximately 90-minutes, but gradually increasing in length throughout sleep due ... ...
- Word Count: 1205
- Approx Pages: 5
- Has Bibliography
- Grade Level: High School
