AP PSYCHOLOGY

Detailed explanation-1: -Stage 2. Stage 2 NREM sleep sees a continued slowing of heartbeat, breathing, muscle activity, and eye movements. During this stage, you also experience a reduction in body temperature. Throughout the course of the night, you spend about half the time in stage 2 sleep.

Detailed explanation-2: -Sleep spindles may be present in all stages of NREM, but they are most prevalent in stage 2 sleep.

Detailed explanation-3: -Stage 2: Non-REM sleep This stage involves the light sleep just before deep sleep. Your body temperature decreases, your eye movements stop, and your heart rate and muscles continue to relax. Your brain waves briefly spike then slow down. During a night of sleep, you spend the most time in stage 2.

Detailed explanation-4: -As we move into stage 2 sleep, the body goes into a state of deep relaxation. Theta waves still dominate the activity of the brain, but they are interrupted by brief bursts of activity known as sleep spindles (Figure SC. 9).