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Sleep is a highly conserved behavior across animal evolution, [6] likely going back hundreds of millions of years, [7] and originating as a means for the brain to cleanse itself of waste products. [8] In a major breakthrough, researchers have found that this cleansing may be a core purpose of sleep. [9]
The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, ...
Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic , bifurcated , or bimodal ) sleep refers to two periods, while polyphasic usually means more than two. [ 1 ]
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 ...
Two new studies suggest once again the importance of getting a good night's sleep for good health over a lifetime, as scientists pursue new understandings of restorative deep sleep.
Sleep does not just mean a time to rest, he suggested. "It is also an active, transformative state of the brain," he said. The research team said it plans to explore how sleep and wake dynamics ...
One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.
Sleep expert Matthew Walker, director of the Center for Human Sleep Science at the University of California, Berkeley and author of the excellent book Why We Sleep, says that sleep is the single ...
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