Sleep Flashcards
Why do we sleep?
- Consolidate memory
- Activate system to clear out waste products in metabolic activities
3 sleep measures
- EEG
- EMG
- EOG
Electroencephalogram (EEG) records…
Brain-wave activity (the sum between the 2 electrodes)
Electromyogram (EMG) records…
Muscle activity
Electrooculogram (EOG) records…
Eye movement
A sleep cycle lasts about ____ min and contains ___ stages
90; 4
____ waves and ____ waves are sign of wakefulness
Alpha; Beta
Wave patterns definitive for stage 2 are…
Sleep spindle (非常密集) and the K complex (猛然长波)
Stage 3 has less than ____% of ____ wave, whereas the stage 4 consists of ____% of it.
50; Delta; 80
EEG frequency is ____ during wakefulness and ____ as the person progresses into the sleep stages.
High; low
In an EEG, REM sleep consists of ____and ____ activity.
Theta; beta
Stages 1–4 are ____-____ sleep, and stages 3–4 are ____min in total
Non-REM; 40
As sleep progresses, slow-wave sleep ____ in duration, while REM sleep ____ in duration.
Decrease; Increase
After the first cycle into the course of sleep, stage 1 are replaced with ____ sleep.
REM
Characteristics of REM sleep
- Rapid eye movement
- Antonia (loss of muscle tone)
- Low amplitude, high frequency EEG (increases to waking levels)
- Muscles of the extremities occasionally twitch