AP PSYCHOLOGY

Detailed explanation-1: -This is the lightest stage of sleep and begins when more than 50% of the alpha waves are replaced with low-amplitude mixed-frequency (LAMF) activity. Muscle tone is present in the skeletal muscle, and breathing tends to occur at a regular rate.

Detailed explanation-2: -Stage 1. Stage 1, also called N1, is essentially when a person first falls asleep. This stage normally lasts just one to seven minutes. During N1 sleep, the body has not fully relaxed, though the body and brain activities start to slow with periods of brief movements.

Detailed explanation-3: -Stage 1. Stage 1 of the sleep cycle is the lightest phase of sleep and generally lasts about seven minutes. The sleeper is somewhat alert and can be woken up easily. During this stage, the heartbeat and breathing slow down while muscles begin to relax.

Detailed explanation-4: -Stage 1: Your eyes are closed, but it’s easy to wake you up. This phase may last for 5 to 10 minutes. Stage 2: You are in light sleep. Your heart rate slows and your body temperature drops.

Detailed explanation-5: -You usually start the sleep cycle with stage 1 of non-REM sleep. You pass through the other stages of non-REM sleep, followed by a short period of REM sleep. Then the cycle begins again at stage 1. A full sleep cycle takes about 90 to 110 minutes.