PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -Rapid eye movement (REM) sleep is characterized by darting movements of the eyes under closed eyelids. Brain waves during REM sleep appear very similar to brain waves during wakefulness.

Detailed explanation-2: -Brain waves during REM sleep appear very similar to brain waves during wakefulness. In contrast, non-REM (NREM) sleep is subdivided into three stages distinguished from each other and from wakefulness by characteristic patterns of brain waves.

Detailed explanation-3: -Indeed, they distinguished two groups of delta waves occurring during REM sleep: slower (<2 Hz) waves, recorded in medial-occipital regions, present in both NREM and REM sleep, and faster (2.5–3 Hz), REM-sleep-exclusive, fronto-central/occipito-temporal “sawtooth” waves.

Detailed explanation-4: -Because the cortical EEG of REM sleep resembles that of the waking state (Dement, 1958), REM sleep has been alternatively called by some investigators “paradoxical sleep” or “active sleep.”