AP PSYCHOLOGY

Detailed explanation-1: -Sympathetic-nerve activity: Sympathetic-nerve activity decreases as NREM sleep deepens; however, there is a burst of sympathetic-nerve activity during NREM sleep due to the brief increase in blood pressure and heart rate that follows K-complexes.

Detailed explanation-2: -The first REM period is short, and, as the night progresses, longer periods of REM and decreased time in deep sleep (NREM) occur. 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.

Detailed explanation-3: -What happens to NREM-3 sleep as the night goes on? Gets briefer then disappears. How much of an average night’s sleep do we spend in REM? 20-25% of night’s sleep.

Detailed explanation-4: -Sleep stages In general, deep sleep (slow wave sleep) decreases with age in the adult population. During nocturnal sleep, the proportion of non-rapid eye movement sleep (NREM) stage 1 and stage 2 increases with age, and the proportion of slow-wave sleep and REM sleep decreases with age2, 11 (see Figure 1).

Detailed explanation-5: -When you wake up during non-REM sleep, your blood pressure, heart rate and brain activity are slowed down, helping you feel awake and alert much quicker.