Suprachiasmatic nucleus scn in hypothalamus sensitive

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Suprachiasmatic Nucleus (SCN) In hypothalamus Sensitive to changes in light, relays this info to pineal Controls the PINEAL GLAND Secretes Melatonin
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Melatonin=HORMONE that causes sleepiness Dark = SCN tells the pineal gland to secrete MORE melatonin Ligh t= SCN tells the pineal gland to STOP secreting melatonin People who work night shifts have higher risks for mental health disturbances, mistakes, bad memory, ect. BLUE light is most similar to the sun’s rays and can keep ppl alert. BLUE light is released by technology It is NOT GOOD BEFORE BED- disturbs sleep/makes you artificially alert People that do not see light have cycles that last 25 hours Seasonal Affective Disorders (SAD) Clinical depression Depression in winter that lifts in spring/summer Attributed to lack of sunlight 10% of people get it in New Hampshire Only 1.4% of people get it in Florida 4-6% of people get it most population
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Treat with light therapy or antidepressants Try to breakdown melatonin and release it! Theories of Sleep Evolutionary/Adaptive Theory We sleep for our own protection Humans are not safe in the dark- we don’t have claws or nocturnal vision-can’t protect ourselves. We sleep to get out of the dark and take shelter Stay out of trouble! Lions/tigers sleep for longer- their prey sleep far shorter (kind of proof?) Restorative theory Supports growth Purpose is to allow for PHYSICAL HEALTH HGH is released As kids sleep lets us grow, as adults it repairs our muscles/tissues Getting enough sleep is the best thing an athlete can do
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