Study Notes on SLEEP - Date not accurate
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SLE E P
Many areas of the brain are more active during sleep than during
the conscious experience of the outside world is “turned off”
sleep is an altered state of consciousness
•The brain processes information during sleep. About spatial
•There are different psychophysiological states during sleep, and
these occur in a cycle
Brain activity slows & becomes more synchronized
STAGES OF SLEEP:
•[Alert Wakefulness]: BETA WAVES
oV. short, frequent, desynchronized waves
•[Just Before Sleep]: ALPHA WAVES
oLess short, more synchronized
•Stage 1: THETA WAVES
Can be easily aroused, may not be aware of having been asleep. One may see
fantastical images or have the sensation of falling etc.
oSleep spindles: occasional bursts of mental activity
oK-complexes: waves with high amplitude (large waves)
More regular breathing, less sensitive to external stimuli
•Stage 3 & 4: DELTA WAVES
o“slow-wave sleep” – deep, slow, high waves.
Difficult to awaken people in these stages, it is disorienting when they
are woken up.
HOWEVER, some information is still being processed (ex: a fire alarm
would wake you up environment is evaluated for potential danger)
•REM: the sleep cycle reverses!! Stage 2 flurry of BETA WAVE
oAka “paradoxical sleep”: sleeping body, activated brain. Some
neurons in the brain (esp. in brainstem & occipital cortex) are
more active in REM than during wakefulness
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