SLEEP. Dement and Kleitman (1930’s). Qu. How do we measure sleep?. Electro-encephalogram ( Head ) Electro-oculogram ( Eye ) Electro-myogram ( Neck ). EEG TODAY. Brain Waves and Sleep Stages. Awake. 1. 2. 3. REM. 4. 0. 1. 2. 3. 4. 5. 6. 7. Hours of sleep.
Qu. How do we measure sleep?
Evolutionary/circadian rhythm model Sleep’s main purpose is to increase a species’ chances of survivalQu. Why do we Sleep?
Following sleep deprivation, we recover much of our lost sleep but there is some segregation of recovery of different types of sleep.
Following selective SWS or REM deprivation, there is selective recovery
Qu. If REM is for neurotransmitter recovery, why do infants spend 50% of their sleep in REM, but by the first year they have half of that (when most learning occurs)?RESTORATION OR ADAPTION?Jim Horne (1999) asks……
Evolutionary/circadian rhythm model
Sleep’s purpose = increase the chances of survival
Species sleep patterns are different due to….
All mammals and birds sleep.
Qu. Can you explain these differences?
Fish, reptiles and amphibians have periods of ‘inactivity’
Qu. What would happen to the sleep patterns of animals who can function at night?