AP PSYCHOLOGY

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 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: -Slow-wave sleep (SWS), often referred to as deep sleep, consists of stage three of non-rapid eye movement sleep. It usually lasts between 70 and 90 minutes and takes place during the first hours of the night.

Detailed explanation-3: -The brain activity during this period has an identifiable pattern of what are known as delta waves. For this reason, stage 3 may also be called delta sleep or slow-wave sleep (SWS). Experts believe that this stage is critical to restorative sleep, allowing for bodily recovery and growth.

Detailed explanation-4: -Deep nonrapid eye movement (NREM) sleep, also known as slow wave sleep (SWS), is considered to be the most restorative sleep stage and to be associated with sleep quality1, 2 and maintenance of sleep.