Chapter 1 Sleep Flashcards
NREM sleep
A type of sleep that is broken into four stages, where the sleeper falls into a deeper and deeper sleep as the stages progress; characterised by relaxation of the muscles, a slowing down of physiological functions and brainwaves that decrease in frequency and increase in amplitude
REM sleep
A type of sleep characterised by brainwaves with high frequency and low amplitude; the muscles of the body are in a state of paralysis and dreams may be experienced.
Hypnic jerk
A reflex muscle contraction that occurs during stage 1 NREM sleep as the body is relaxing.
Sleep spindles
A type of brain activity characterised by a short burst of jigs-frequency brainwaves, experienced during stage 2 NREM sleep
K-complex
A short burst of high-amplitude brainwaves, experienced I’m stage 2 NREM sleep
Slow wave sleep (SWS)
A sleep state characterised by the emergence of delta waves; SWS is experienced during stage 3 and 4 NREM sleep
Restorative theory
A theory that states that sleep is vital for replenishing and revitalising the mind and body to keep them functioning at optimal levels.
Adaptive theory
A theory that suggests that we have periods of inactivity, or sleep, when we do not need to engage in activities important to our survival.
Dream
A series of images, thoughts and emotions that passes through the mind during sleep
REM behaviour disorder
A disorder whereby there is a failure of the muscle paralysis that occurs during REM sleep
Sleep deprivation
Going without or not getting sufficient amounts of sleep
Sleep-deprivation psychosis
A disruption of mental and emotional functioning as a result of lack of sleep
REM rebound
The process whereby an individual experiences extra amounts of REM sleep after being deported of if
Micro sleep
A short period of sleep, where the individual appears to be awake
Circadian rhythm
Out internal body clock, which cycles approximately every 24 hours
