While You Were Sleeping

WHILE YOU WERE SLEEPING muymm www -The Five Stages of Sleep - STAGE 1 STAGE 2 STAGE 3 STAGE 4 STAGE 5 DROWSY LIGHT SLEEP MODERATE SLEEP DEEP SLEEP REM SLEEP Transition between wakefulness Brain starts to produce deep, A very deep sleep Brain produces rhythmic brain waves called sleep spindles. Known as Rapid Eye Movement and sleep. slower brain waves called delta waves. Delta waves continue Brain produces slow brain waves called theta waves. Characterized by eye movements, increased respiration rate and brain activity. Body temperature decreases. Transitional period between a light sleep and deep sleep. Lasts about 30 minutes Heart rate slows. Only lasts about 5-10 minutes. Bed wetting and sleepwalking occur during the end of this stage Muscles become more relaxed Lasts about 20 minutes. while brain system is more active. If you awake during this stage, you might think that you weren't really asleep. Dreaming occurs because of the increase in brain activity and temporary paralysis of voluntary muscles. sleep genius http://www.ninds.nih.gov/img/sleep-1.gif • http://psychology.about.com/od/statesofconsciousness/a/SleepStages.htm • http://hubblesite.org/gallery/album/star/pr2002015a/