PSYC 2000 Chapter : Exam 2 Guide
Document Summary
Neurobiology of sleep: circadian rhythm- about a day. Suprachiasmatic nucleus (scn) of the hypothalamus, pineal gland and melatonin: when it gets dark- scn triggers melatonin release: makes you sleepy, when it gets light- Serotonin- sleep regulation: body temperature- high: alert, low: sleepy, adenosine- build up makes us sleepy, caffeine= adenosine antagonist (opposite of adenosine, makes wakeful) Light sleep: ppl will deny they were sleeping: theta waves replace alpha waves, even slower, hypnic jerk, common, hallucinations during this stage- hypnogogic images. Non-rem stage 2 (n2): temp drops, heart rate slows, breathing is shallow. Sleep spindles: theta waves continue, aware you were asleep. N4: deepest sleep, body growth occurs, disoriented if woken. Rem: body temp rises to wake, eye lids move, heart rate increases: brain waves resemble beta waves, dreams take place, voluntary muscles are paralyzed. Importance of rem sleep: microsleeps: few seconds of sleep, allnighters: cause problems in concentration and simple task.
