Circadian rhythm internal timing mechanism cycle of activity ~ 24 hours.
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Transcript of Circadian rhythm internal timing mechanism cycle of activity ~ 24 hours.
![Page 1: Circadian rhythm internal timing mechanism cycle of activity ~ 24 hours.](https://reader036.fdocuments.us/reader036/viewer/2022062422/56649f115503460f94c23b49/html5/thumbnails/1.jpg)
circadian rhythm
• internal timing mechanism
• cycle of activity
• ~ 24 hours
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suprachiasmatic nucleus
SCN of hypothalamus > pineal gland (melatonin)
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suprachiasmatic nucleus
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entrainment & SCN
What does it mean to “entrain” the SCN?
What cues can entrain the SCN?
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jet lag
• fatigue & inefficiency
• body clock out of phase with timing of your surroundings
phase-advance
phase-delay
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• body restoration
why sleep?
• strengthens learning & memory• evolutionary adaptation
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evolutionary adaptation
• prevent injury in dark
• energy conservation
• predation & meal frequency
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evolutionary adaptation
gorillas
bears
lions
grazing animals
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EEG vs. EOG
electroencephalograph vs. electro-oculograph
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awake
stage 1
stage 2
stage 3
stage 4
REM
relaxed wakefulness
slow wave sleep
slow wave sleep
• resembles wakefulness• irregular activity• paralysis (pons)
• rapid eye movement
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overnight
slow wave sleep
REM
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awake
stage 1
stage 2
stage 3
stage 4
REM• dreams w/ plot• paralysis
• sleepwalking• sleeptalking• night terrors
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sleep disorders
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insomnia
3 types:
- hard to fall asleep
- wake too early
- wake frequently overnight
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insomnia
Restless Leg Syndrome
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Do you ever clench or grind your teeth at night?
bruxism
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discussion
As a child, ever wake up screaming?
Difference between
night terror & nightmare?
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sleeping pills
benzodiazepines
“Ambien”
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discussion
Should a person be accountable for their behavior?
“Ambien Drivers”
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other
Heard stories of a guy attacking someone in his sleep?
REM Sleep Behavior Disorder
(violence?)
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discussion
Difference between sleepwalking & REM Sleep Behavior Disorder?
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discussion
When you awaken, you are paralyzed.
You can hear, feel, think but can’t move!
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narcolepsy
a broad category
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narcolepsy
sudden attacks of extreme, irresistible sleepiness midday
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sleep paralysis
When you awaken, you are paralyzed.
You can hear, feel, think but can’t move!
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hallucinations
• hypnopompic
• hypnogogic
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cataplexy
loss of muscle control during high emotion
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dreams
• environmental stimuli
ACTIVATION SYNTHESIS THEORY
• random pons firing activates brain
• cortical areas try to make sense of random info• frontal lobe is shut down so no logic
• issues preoccupied with