PSY3320 Lecture Notes - Lecture 8: Sleep Debt, Delta Wave, Excessive Daytime Sleepiness
15 Oct 2018
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Document Summary
No consensus on when sleep patterns start emerging as it"s hard to measure. Mechanisms of sleep-wake development are seen before birth. 20-28 weeks we see rhythmic cycling of activity. 30-38 weeks > majority of time spent in quiescence (sleep), either quiet (nrem) or active (similar to rem), mostly active at this stage. Indetermined sleep (not active or quiet sleep), declines with brain maturation. At 38 weeks we see a decline in active sleep. 65% of the day spent in quiescence (asleep) and 71% of the night spent asleep. Brain states differ for abnormal versus normal brain health. Foetal biological clock is responsive to maternal entrainment and is oscillating by the final trimester. New-borns sleep around 16 hours a day. By 1 year, sleeping 12-15 hours a day. Ultradian rhythm: 3/4 hours, sleep wake cycle. Kleitman & engleman (1951) > we can see that neonates develop a circadian rhythm however they are free running.
