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Sleep paralysis demons: What are they and how to handle them
This occurs when the temporary paralysis, which is a normal feature of REM, the stage of sleep called ... are marked by sensations of pressure on the chest, along with feelings of suffocation ...
Nature5y
Peripheral vasoconstriction during REM sleep detected by a new plethysmographic method
Rapid-eye-movement (REM) sleep is associated with more sympathetic activation than is NONREM sleep 1,2. So far, there are no data regarding vascular tone during REM and NONREM sleep in humans.