PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -The sleep cycle: A sleep cycle lasts about 90 minutes, and during that time we move through five stages of sleep. The first four stages make up our non-rapid eye movement (NREM) sleep, and the fifth stage is when rapid eye movement (REM) sleep occurs.

Detailed explanation-2: -Each cycle lasts 90 minutes on average, and the recommended sleep time for adults is 7-8 hours. You can fit five complete 90-minute cycles during that time. If you sleep more or less, you risk interrupting these cycles and not resting well enough.