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Ostriches sleeping, with REM and slow-wave sleep phases [1]. Slow-wave sleep (SWS), often referred to as deep sleep, is the third stage of non-rapid eye movement sleep (NREM), where electroencephalography activity is characterised by slow delta waves.
Known as slow-wave sleep or stage 3 non-REM sleep, this is the deepest stage of sleep and the hardest to wake up from. Brain activity slows down, muscles and bones strengthen, hormones regulate ...
Rapid eye movement sleep (REM sleep or REMS) is a unique phase of sleep in mammals (including humans) and birds, characterized by random rapid movement of the eyes, accompanied by low muscle tone throughout the body, and the propensity of the sleeper to dream vividly. The core body and brain temperatures increase during REM sleep and skin ...
Non-REM and REM sleep are so different that physiologists identify them as distinct behavioral states. Non-REM sleep occurs first and after a transitional period is called slow-wave sleep or deep sleep. During this phase, body temperature and heart rate fall, and the brain uses less energy. [11] REM sleep, also known as paradoxical sleep ...
Deep sleep happens in stage 3, while REM sleep occurs in stage 4. Deep sleep is more restorative, while REM sleep plays an important role in brain development. Both REM sleep and deep sleep are ...
Each sleep cycle lasts about 90 to 110 minutes and includes stages that fall into two main phases: non-REM (or NREM) sleep and REM sleep. Non-REM sleep has three sub-stages: light sleep, deep ...
Stage 3 was formerly the transition between stage 2 and stage 4 where delta waves, associated with "deep" sleep, began to occur, while delta waves dominated in stage 4. In 2007, these were combined into just stage 3 for all of deep sleep. [7] Dreaming is more common in this stage than in other stages of NREM sleep though not as common as in REM ...
The first three stages are light sleep, deeper sleep, and deepest sleep, all of which are classified as non-rapid eye movement (NREM) sleep. The fourth stage is rapid eye movement (REM) sleep ...