AP PSYCHOLOGY

Detailed explanation-1: -During the night, you cycle through two types of sleep: non-rapid eye movement (non-REM) sleep and rapid eye movement (REM) sleep. Your brain and body act differently during these different phases.

Detailed explanation-2: -During normal sleep, a person goes through four to five sleep cycles that last about 90 minutes each and include both non-REM sleep and REM sleep. Also called non-rapid eye movement sleep and NREM sleep.

Detailed explanation-3: -REM stands for rapid eye movement. During REM sleep, your eyes move around rapidly in a range of directions, but don’t send any visual information to your brain.That doesn’t happen during non-REM sleep. First comes non-REM sleep, followed by a shorter period of REM sleep, and then the cycle starts over again.

Detailed explanation-4: -NREM Stage 2 According to the American Sleep Foundation, people spend approximately 50% of their total sleep time during NREM stage 2, which lasts for about 20 minutes per cycle. 4. During stage 2 sleep:1. You become less aware of your surroundings. Your body temperature drops.

Detailed explanation-5: -Stage 4: REM sleep This stage first happens about 90 minutes after you fall asleep. Your eyes move quickly from side to side during REM sleep. In REM sleep, your brain waves and eye movements increase. Your heart rate and breathing also speed up.