Light ash experiment !
Auditory stimulus studies!
Memory recall experiment!
Hypnic myoclonus, sleep muscle jerk!
Most likely when sleep is disrupted!
Breakthrough of REM imagery without REM
What would make you think
someone is sleeping?!
Behavioral quiescence (physical quiescence)!
Stereotypic, species-specic posture
(and specic sleeping site)!
Elevated threshold for arousal and reactivity!
Rapid waking with moderately
Last Chance to Turn In Duck
Problem Set is Right NOW!
Some birds have Unihemispheric SWS!
Chicken (Gallus gallus domesticus)!
Peters et al. 1965; Ookawa and Gotoh 1965!
Japanese Quail (Coturnix coturnix japonic
Sleepwalking ensues when the cortex says
move in NREM sleep!
REM sleep behavior disorder ensues when
REM sleep motor inhibitory systems do not
function in REM sleep!
Narcolepsy (cataplexy, sleep paralysis) ensues
when REM sleep motor inhibitory systems
Brain mechanisms of REM sleep!
REM cycle generation
Regulation of REM Sleep
Model from population biology!
Motor system in REM sleep!
Rapid eye movement
History of Brain Mechanisms in
Sleep Mirrors Techniques
Lucretius (circa 30 BC): sleep is the
absence of wakefulness!
Early 20th Century: sleep occurs passively
when sensory input falls below a level
necessary to maintain wakeful
are as different from one
another as night is from day.!
Four stages (1, 2, 3, 4) based on EEG!
NREM stages roughly parall
Pressure-sensitive mattress pad: movements,
heart rate, breathing (but only when in bed) !
Optimal Sleep in College-Aged
Actigraphy: movement only (but is
Time-lapse still photography: developed by
an Artist (Ted Spag
Introduced the modern era of sleep research!
Psycho-physiology: established a biological
basis for a psychological process!
Lets look more closely at how they did
Sleep propensity oscillates
with a circadian variation
(Process C) !
Sleep propensity increases
as waking accumulates
and dissipates during sleep
(Process S) !
Whats wrong with this picture?!
Where are you from?!
Frequency vs period!