Flashcards in Chapter 4 Definitions Deck (12):
Biological rhythms with cycles that occur on a 24 hour cycle (Eg. Sleep/wake pattern, alertness, body temperature etc.).
Biological rhythms with cycles shorter than 24 hours (Eg.REM/NREM cycles).
When a person wakes up (often screaming) in sheer terror but rapidly returns to sleep and has no recollection of the event the next morning.
STAGES 3&4 NREM - Common in young children (3-6 years old).
The graph which the REM/NREM cycle is plotted on.
The relaxed state that occurs during the transition from being awake to being asleep.
Involuntary muscle twitches that cause us to jolt.
The total relaxation of muscles to the point of paralysis when in REM sleep.
Period between being asleep and waking up, a time when the brainwaves are predominantly alpha waves.
- Hypnopompic (vivid) images are often seen during this phase.
Explain the survival theory of sleep
Suggests that organisms undertake periods of inactivity, or sleep, in order to enhance their chances of survival. They do this by conserving energy and protecting themselves during periods of the day when they are most vulnerable.
Explain the restorative theory of sleep
Suggests that sleep allows us to recharge our bodies, recover from the physical/physiological work during the day and allows our bodies' growth processes to function.