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Lecture 7

Lecture 7

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Wilfrid Laurier University
Don Morgenson

Michael Matthews October 5, 2011 Lecture #7  Circa Dies- circadian rhythms. Can influence many factors. (How you write an exam)  Through a 24 hours period, your body temperature will vary between 2 degrees. When our body temperature is at its max, we are at our max.  During the evening, the immune system recedes slightly.  The control of this rhythm is found in the hypothalamus in the supercliasmatic nuclei. Secretes melatonin, makes us want to go to sleep. Melatonin levels peak during the hours of 1 and 3.  Most Canadians ignorant about their sleep.  Micro sleeps are 10-20 second sleeps that can happen at the wheel. When the mind is tired the memory is not as effective and clear, judgement is skewed.  Between 1-6 am it is normal for us to feel tired.  Circadian rhythm phase advance (jet lag) flying from west to east. Phase delay, is flying east to west. Most do not like the phase advance because it leads to more accidents. (7% increase in accidents)  Death’s counterfeit the sleep god and death god were identical.  When you are allowed to sleep as much as you need, you average 10.3 hours a day.  Stages of sleep:  First few minutes is the first stage, when you have the sensation of falling and jerking around. Stage two last about 3o minutes, sleep spindles at 10 cycles per second.. Stage three is a transitional stage from 2 to 4. Stage 4 is a very deep sleep, 1 spindle per second). Generally at stage 4 is when problems like bed wetting happens. After about an hour of stage 4, you move up through the stages and you enter the most interesting state which is called “dream sleep” R.E.M. (rapid eye movements) sleep.  Called paradoxical sleep because they look like they are very relaxed, yet the brain is very fired up and aroused. This cycle continues to repeat itself every 90 minutes.  Why do we sleep? It is restorative would seem fairly common sense. The body heals itself from the daily wear and tear. It reconstitutes the brain, as it reorganizes itself. It also reconsolidates memories. During sleep we have metabolic waste that is removed. Ecological niche.  The animals that are at the top of the food chain get much more sleep than those at the bottom. If our need is eight hours of sleep, than it implies that it takes that group 16 hours to gather food.  Sleep has profound implications for growth. Our pituitary glands inspire growth as we sleep. Newborns spend about 2/3 of their day sleeping.  Studies do now confirm that there are firm connections between good sleeping and memory. When people learn a new skill, they don’t perform better until a good sleep. Sleep is more important than intellectual power in terms performance.  An 8 hour sleep, the first 2 hours of sleep is that brain chemicals plummet at information flows outside of the hippocampus into the cortex. The next four hours the brain is very active as the brain involves itself in an internal dialogue as it sorts where the information is
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