PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -Stage 3 of sleep is often referred to as deep sleep or slow-wave sleep because these stages are characterized by low frequency (less than 3 Hz), high amplitude delta waves (Figure 4).

Detailed explanation-2: -Stage N3: Delta Waves The slow delta waves only occur during the deepest stage of sleep, and as such are predominant in stage N3. Delta brain waves are the slowest brain waves, measuring at 0.5 to 3 Hertz.

Detailed explanation-3: -In the deepest level of sleep, stage IV sleep, the predominant EEG activity consists of low frequency (1–4 Hz), high-amplitude fluctuations called delta waves, the characteristic slow waves for which this phase of sleep is named. The entire sequence from drowsiness to deep stage IV sleep usually takes about an hour.