Psych Lecture Sleep

Psych Lecture Sleep - Are Circadian Rhythms internally or...

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Are Circadian Rhythms internally or externally driven? 1. Circadian Rhythms: a. a.i. In one month you would be b. Suprachiasmic Nucleus: involved in resetting our internal clocks b.i. Produces melatonin c. Theories of Sleep: c.i. Adaptive Theory: we don’t really need to sleep; we only sleep to keep ourselves out of trouble. We can’t see during the night very well. c.i.1. Gradually a chemical is increasing until we cannot bear it any longer but to sleep. c.i.2. Brain runs off glucose. There is Glycogen in the muscles as an additional sugar source. The brain breaks down glycogen into glucose, with adenosine as a by product. c.i.3. Caffeine prevents adenosine from being produced so that you stay awake. c.ii. Repair Theory: we have used too much energy and at night time we will replenish c.ii.1. Body Version: we are replenishing the glucose for the day. Not really true… c.ii.2. Brain Version: if the brain has been over exerted, the people with more energy spent towards thinking, they tend to sleep more. c.iii. Maybe both theories are true together. d. Electro-encephalogram (EEG) measures the activity of all the neurons firing in the brain. Measures the entire output of the neurons in the brain. On a graph of voltage with time, our brain is more like a graph of y=5, a straight path high frequency low amplitude activity, large amplitude low frequency sleep. 2.
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Psych Lecture Sleep - Are Circadian Rhythms internally or...

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