Biological Rhythms

Regularly occurring cycles of behaviors.

Ex. Womens menstruation cycles,

animal migration

• stage of sleep characterized by the quick fast eye movements and dreaming.
• about 25% lof sleep time
• awareness of external events is dramatically lowered
• muscles shut down

• deep sleep, slow brain waves
• 3 stages N1, N2, N3

• state of drowsiness
• slower brain waves, theta
• some muscle tone and awareness of the environment is lost

Stage N2 Sleep

• further muscle tone, complete loss of awareness of the environment
• sleep spindles 

• slow wave sleep, deepest level of sleep
• sleepwalking, sleeptalking, nightmares

• difficulty falling or staying asleep
• causes: physical injury, psychological problems (stress, relationship difficulties)

• a sleep disorder where pauses in breathing that last 10 seconds or more 
• caused by obstruction of the throat that occurs when we fall asleep

Narcolepsy

• a disorder characterized by extreme daytime sleepiness and "nodding off"

• the succession of images, thoughts, sounds and emotions that pass through our minds while sleeping