01:830:101 Lecture Notes - Lecture 8: Brainstem, Cortisol, Information Processing
3 Oct 2018
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By the end of the chapter, will be able to answer: Circadian rhythm: our biological clock (controlled by hypothalamus) It provides an approximate schedule for our physical processes. Knows to keep us awake during light and change our states to sleepy during night time. Melatonin: a hormone that causes our sleepiness. In darkness, pineal gland puts out melatonin while at morning (light) it stops its production. People are more sad during the winter because not so much sunlight is present. Side note: we become sleepy during 2:30 pm, and thus some countries give midday breaks between 2-4. Sleep consist of 90 min sleep-cycles stages. Non rapid eye movement (n-rem): a non-dreaming sleep (3 stages) Stage 1: similar to drowsiness light sleep. Reduction of heart rate and muscle tension. Stage 3 and 4: deeply asleep; hard to awaken, disoriented when awake. Growth hormones are released from pituitary (main)
