PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -Deep, slow brain waves known as delta waves begin to emerge during NREM stage 3 sleep-a stage that is also referred to as delta sleep. This is a period of deep sleep where any environmental noises or activity may fail to wake the sleeping person.

Detailed explanation-2: -Stage 3 sleep is also known as N3 or deep sleep, and it is harder to wake someone up if they are in this phase. Muscle tone, pulse, and breathing rate decrease in N3 sleep as the body relaxes even further. The brain activity during this period has an identifiable pattern of what are known as delta waves.

Detailed explanation-3: -Stage 3 NREM sleep consists of delta waves or slow waves. Awakenings or arousals are rare and often it is difficult to wake up someone in Stage 3 sleep. Sleep conditions like parasomnias (which can include sleepwalking, sleep talking and night terrors, ) occur during the deepest NREM stage of sleep.

Detailed explanation-4: -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.

Detailed explanation-5: -NREM and REM Sleep Cycles A sleep episode begins with a short period of NREM stage 1 progressing through stage 2, followed by stages 3 and 4 and finally to REM.