PSY 1 Lecture Notes - Microsleep, Bruxism, Cataplexy
Document Summary
Delta = stage 3 & stage 4. Delta waves most prominent in this stage. Sleep cycles each are about 10 mins. All mammals have dual sleep except - monotremes (anteaters, platypus) & cetaceans (whales, dolphins) Sleep wake cycle governed by an internal 25 hour clock circadian rhythm - tuned to 24 hours by sun. Rem periods alt with non-rem according to 90-100 min ultradian rhythm. Rem periods last longer as night progresses. Babies have most rem sleep and this slowly goes down with age. Sleep bocmes lighter & wakefulness becomes sleepier. People sleep less as older & proportion of time in rem decreases. Aging is ofton accompanied by chronic sleep deprivation due to illness, pain, breathing, peeing. 1 - transition between wakefulness and clear sleep. 2 - first bona fide sleep stage point of no return at onset. Left hemisphere sleeps - right awake; then they switch places.
