NEUR 2P37 Lecture Notes - Lecture 6: Slow-Wave Sleep, Sleep Spindle, Rapid Eye Movement Sleep
1 Feb 2017
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Document Summary
1/3 of our lives (we spend asleep) W/o sleep, we suffer significant cognitive impairment. Network of brain areas is involved in both sleep and maintaining wakefulness. Sleep follows a regular cycle each night. Rapid eye movement (rem) alternates w/ no-rem (nrem) sleep. Sleep cycles and typical patterns of brain waves during sleep: the sleeping brain cycles through the different stages during the night, repeating four or five approx. hour and a cycles, eeg recordings from different sleep stages. Alpha waves are present when one begins a state of relaxation: stage 1 sleep: The eef is dominated by irregular, jagged, and low voltage waves. Brain activity begins to decline: stage 2 sleep: Sleep spindles; 12 hz to 14 hz waves during a burst that lasts at least half a second. K-complex; a sharp high-amplitude negative wave followed by a smaller, slower positive wave. * the more sleep spindles you have, the better you retain information through memory: stage 3 (&4)
