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circadian rhythm
• internal timing mechanism
• cycle of activity
• ~ 24 hours
suprachiasmatic nucleus
SCN of hypothalamus > pineal gland (melatonin)
suprachiasmatic nucleus
entrainment & SCN
What does it mean to “entrain” the SCN?
What cues can entrain the SCN?
jet lag
• fatigue & inefficiency
• body clock out of phase with timing of your surroundings
phase-advance
phase-delay
• body restoration
why sleep?
• strengthens learning & memory• evolutionary adaptation
evolutionary adaptation
• prevent injury in dark
• energy conservation
• predation & meal frequency
evolutionary adaptation
gorillas
bears
lions
grazing animals
EEG vs. EOG
electroencephalograph vs. electro-oculograph
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
overnight
slow wave sleep
REM
awake
stage 1
stage 2
stage 3
stage 4
REM• dreams w/ plot• paralysis
• sleepwalking• sleeptalking• night terrors
sleep disorders
insomnia
3 types:
- hard to fall asleep
- wake too early
- wake frequently overnight
insomnia
Restless Leg Syndrome
Do you ever clench or grind your teeth at night?
bruxism
discussion
As a child, ever wake up screaming?
Difference between
night terror & nightmare?
sleeping pills
benzodiazepines
“Ambien”
discussion
Should a person be accountable for their behavior?
“Ambien Drivers”
other
Heard stories of a guy attacking someone in his sleep?
REM Sleep Behavior Disorder
(violence?)
discussion
Difference between sleepwalking & REM Sleep Behavior Disorder?
discussion
When you awaken, you are paralyzed.
You can hear, feel, think but can’t move!
narcolepsy
a broad category
narcolepsy
sudden attacks of extreme, irresistible sleepiness midday
sleep paralysis
When you awaken, you are paralyzed.
You can hear, feel, think but can’t move!
hallucinations
• hypnopompic
• hypnogogic
cataplexy
loss of muscle control during high emotion
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