nature & lifespan of sleep

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  • NATURE OF LIFESPAN & SLEEP
    • INFANCY
      • 16 hrs - immature versions - active & quiet sleep (half of sleep active) wake every hour or so (cycles less than adults 90 min)
        • PREMATURE babies spend 90% in active sleep - brains need to mature
        • EVOLUTIONARY APPROACH - infant sleep patterns evolved so parents can get on with daytime chores
    • CHILDHOOD
      • 12 HRS - EEG patterns similar to adults - parasomnias common e.g. night terrors
        • INDIVIDUAL DIFFERENCES - E.G. CULTURAL DIFFERENCES - ISRAELI CHILDREN SLEEP 9 HRS AV
    • ADOLESCENCE
      • Sleep INCREASES - boys orgasm/ejaculate - PHASE DELAY - go to sleep later, wake up later
        • HORMONE CHANGES - sex hormones released at night explain sleep disruption - symptoms experienced in adolescence- moodiness
        • CONSEQUENCE of phase delay - poor attention span at school - adjust school day
    • ADULTHOOD
      • 8 HRS - 25% rem - inc in sleep disorders - cycle 90 mins
        • MORE SLEEP NOT GOOD thing - more than 10 hrs, increased mortality risk 30%
    • OLD AGE
      • NAPS, PHASE ADVANCE - sleep earlier, wake earlier - DECREASE in SWS(5%) & REM(20%)
        • LESS SWS = LESS GROWTH HORMONE = OLD AGE SYMPTOMS = LOW BONE DENSITY
        • More difficulty going to sleep - RWA - SLEEP QUALITY IMPROVED BY MELATONIN - INDUCES SLEEP BY INHIBITING BRAIN MECHANISMS THAT PROMOTE WAKEFULLNESS

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