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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 ...
REM sleep is one of the four sleep stages you cycle through each night. During this stage, your eyes move rapidly behind your eyelids (hence the name), and brain waves work similarly to when you ...
In addition, alcohol causes fragmented sleep and suppresses REM sleep, which plays a role in helping your brain process and consolidate new information and helps ensure better mental concentration ...
REM sleep, also known as paradoxical sleep, represents a smaller portion of total sleep time. It is the main occasion for dreams (or nightmares), and is associated with desynchronized and fast brain waves, eye movements, loss of muscle tone, [18] and suspension of homeostasis. [19] The sleep cycle of alternate NREM and REM sleep takes an ...
The sleep cycle has proven resistant to systematic alteration by drugs. Although some drugs shorten REM periods, they do not abolish the underlying rhythm. Deliberate REM deprivation shortens the cycle temporarily, as the brain moves into REM sleep more readily (the "REM rebound") in an apparent correction for the deprivation. [13]
The amount of time and density of REM sleep and SWS decreases with age. [57] [58] [59] Consequently, it is common that the elderly receive no increase in memory after a period of rest. [60] To combat this, donepezil has been tested in healthy elderly patients where it was shown to increase time spent in REM sleep and improve following day ...
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