Biological rhythm internal cycle of biological activity
Circadian rhythm biological rhythm that occurs over
approximately 24 hours
Consciousness awareness of internal and external stimuli
Homeostasis tendency to maintain a balance, or optimal
level, within a biological system
Insomnia consistent difficulty in falling or staying asleep
for at least three nights a week over a month’s time
Jet lag collection of symptoms brought on by travel from one
time zone to another that results from the mismatch between our internal
circadian cycles and our environment
Melatonin hormone secreted by the endocrine gland that
serves as an important regulator of the sleep-wake cycle
Meta-analysis study that combines the results of several related
studies
Pineal gland endocrine structure located inside the brain
that releases melatonin
Rotating shift work schedule that changes from early to late
on a daily or weekly basis
Sleep state marked by relatively low levels of physical
activity and reduced sensory awareness that is distinct from periods of rest
that occur during wakefulness
Sleep debt result of insufficient sleep on a chronic basis
Sleep regulation brain’s control of switching between sleep
and wakefulness as well as coordinating this cycle with the outside world
Suprachiasmatic nucleus (SCN) area of the hypothalamus in
which the body’s biological clock is located
Wakefulness characterized by high levels of sensory awareness, thought, and behavior
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