AP PSYCHOLOGY

Detailed explanation-1: -This is a period of deep sleep where any noises or activity in the environment may fail to wake the sleeping person. During this deep sleep stage, your body starts its physical repairs.

Detailed explanation-2: -N2 (Stage 2)-Deeper Sleep (45%) K-complexes are long delta waves that last for approximately one second and are known to be the longest and most distinct of all brain waves.

Detailed explanation-3: -NREM sleep is divided into stages 1, 2, 3, and 4, representing a continuum of relative depth. Each has unique characteristics including variations in brain wave patterns, eye movements, and muscle tone. Circadian rhythms, the daily rhythms in physiology and behavior, regulate the sleep-wake cycle.

Detailed explanation-4: -View Source, stage 3 slow-wave sleep represents the deepest sleep of the sleep cycle, when brain waves are at their slowest in frequency and highest in amplitude. REM: As the name suggests, your eyes move quickly beneath your eyelids during REM sleep. Your brain activity is similar to that of a person who is awake.

Detailed explanation-5: -Electroencephalography. These four sleep stages are called non-rapid eye movement (non-REM) sleep, and its most prominent feature is the slow-wave (stage IV) sleep. It is most difficult to awaken people from slow-wave sleep; hence it is considered to be the deepest stage of sleep.