PSYC 446 Lecture Notes - Lecture 7: Lightning, Dyssomnia, Circadian Rhythm Sleep Disorder
18 Sep 2018
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While you sleep you cycle through 4 different stages of sleep: nrem (non-rapid eye mvt) stage 1, nrem stage 2, nrem stage 3, rem sleep (rapid eye mvt) In a full night"s sleep, we experience about six sleep cycles, each lasting around 90 mins. Accounts for 5% of total sleep time. Very easy to be woken up when in stage 1 of sleep. In this stage brain activity goes from alpha waves to theta waves. Accounts for 50% of total sleep time. Harder to be woken up from in this stage of sleep. May begin to see delta waves in this stage. Lasts for about 20 to 30 minutes during the first cycle of sleep and then less and less in each cycle. Accounts for about 20% of total sleep time. During this stage your heart rate, breathing, and blood pressure all fluctuate, your eyes move rapidly, and your muscles twitch. A fast pattern of brain waves can be observed.
