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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 ...
Stage 2: Once you enter this sleep cycle (also known as your light sleep stage), your breathing and heart rate slow down and your body fully relaxes. Your eye movement stops, and your brain ...
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 ...
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 ...
REM rebound is the lengthening and increasing frequency and depth of rapid eye movement (REM) sleep which occurs after periods of sleep deprivation. When people have been prevented from experiencing REM, they take less time than usual to attain the REM state. [ 1 ]
“REM sleep, especially the time it takes to enter REM sleep, is potentially important for Alzheimer’s disease. The importance of this sleep metric has been largely ignored previously.
Sleep inertia is a physiological state of impaired cognitive and sensory-motor performance that is present immediately after awakening. It persists during the transition of sleep to wakefulness, where an individual will experience feelings of drowsiness, disorientation and a decline in motor dexterity .
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