PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -NREM and REM Sleep Cycles NREM sleep constitutes about 75 to 80 percent of total time spent in sleep, and REM sleep constitutes the remaining 20 to 25 percent.

Detailed explanation-2: -Within each sleep cycle, we move through different stages of sleep. These include three stages of non-rapid eye movement (NREM) sleep, which make up about 75% to 80% of the night, and one stage of rapid eye movement (REM) sleep, which makes up the remaining 20% to 25%.

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.

Detailed explanation-4: -Your breathing becomes faster and irregular, and your heart rate and blood pressure increase to near waking levels. Most of your dreaming occurs during REM sleep, although some can also occur in non-REM sleep.