Sleep Stages
Non Rem Stage N1
Transition Period "Light Sleep"
Muscle activity slows down; Drowsy, Easily awakened;
Non Rem Stage N2
First stage of true sleep
10-25 minutes; Eye movement stops, heart rate slows down, body temperature drops
Non-Rem N3
Deep Sleep
Difficult to awaken; If awakened, groggy & disoriented; Slow brain waves; Short term memory storage; Hormone release and balance; Blood flow directed away from the brain and towards muscles; Muscular pain management
REM SLEEP
Dream Stage Sleep
70-90 minutes after falling asleep; Rapid eye movement; Heart rate, blood pressure and brain activity increase; Long-term memory storage; Anxiety, depression & pain management; Arms & legs are paralyzed
Sleep typically cycles through these stages 4-5 times throughout the night with each cycle of REM sleep lasting longer each time.