Using a new plethysmographic technique to measure peripheral arterial tone (PAT), we report here that REM sleep in humans is associated with considerable peripheral vasoconstriction. The apparatus ...

Ways in which the body can increase temperature are: Vasoconstriction - blood vessels are restricted and blood flow to skin stops so less heat is lost. Hair erector muscles contract - hairs stand ...

Jain explains this reaction is known as vasoconstriction, where blood vessels constrict to limit blood flow to the penis. "When it's cold out, your body limits blood flow to extremities like ...