AP PSYCHOLOGY

Detailed explanation-1: -A stage of NREM sleep characterized by sleep spindles and K complexes against a relatively low-voltage, mixed-frequency EEG background. Biological pattern of alternating sleep and wakefulness. It is represented by slower brain waves called delta activity on EEG. It is a type of NREM sleep: stages 3 and 4.

Detailed explanation-2: -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-3: -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-4: -Deep sleep, also called slow-wave sleep. View Source, occurs in the third stage of non-rapid eye movement (NREM) sleep. During deep sleep, electrical activity in the brain appears in long, slow waves called delta waves.

Detailed explanation-5: -Stage 3 is often referred to as deep sleep or slow-wave sleep because this stage is characterized by low frequency (less than 3 Hz), high amplitude delta waves (Figure SC. 10). During this time, an individual’s heart rate and respiration slow dramatically.