ch 43 potter sleep Flashcards
is a cyclical physiological process that alternates with longer periods of wakefulness.
Sleep
familiar rhythm is the 24-hour, day-night cycle known as the
diurnal or circadian rhythm
nerve cells in the hypothalamus control the rhythm of the sleep-wake cycle and coordinate this cycle with other circadian rhythms
suprachiasmatic nucleus (SCN)
influence the pattern of major biological and behavioral functions.
- sleep disorders are caused by a misalignment between the timing of sleep and individual desires or the societal norm.
Circadian rhythms
predictable changing of body temperature, heart rate, blood pressure, hormone secretion, sensory acuity, and mood depend on the maintenance of the
24-hour circadian cycle
Factors such as light, temperature, social activities, and work routines
affect circadian rhythms and daily sleep-wake cycles
All people have biological clocks that synchronize their sleep cycles
biological clocks
, which measures electrical activity in the cerebral cortex;
electroencephalogram (EEG)
which measures muscle tone
electromyogram (EMG)
which measures eye movements provide information about some structural physiological aspects of sleep.
electrooculogram (EOG)
major sleep center in the body is the
hypothalamus
hypocretins (orexins) that promote wakefulness and rapid eye movement (REM) sleep.
hypothalamus secretes
Prostaglandin D2, L-tryptophan, and growth factors
control sleep
located in the upper brainstem contains special cells that maintain alertness and wakefulness
reticular activating system (RAS)
receives visual, auditory, pain, and tactile sensory stimuli.
- cerebral cortex (e.g., emotions or thought processes) stimulate RAS
RAS (reticular activating system)
- The homeostatic process (Process S), which primarily regulates the length and depth of sleep;
- circadian rhythms (Process C: “biological time clocks”), which influence the internal organization of sleep and the timing and duration of sleep-wake cycles, operate simultaneously to regulate sleep and wakefulness
2 processes help to regulate sleep/wake cycles.
nonrapid eye movement (NREM) sleep and rapid eye movement (REM) sleep
two sleep phases
sleep, people progress through four stages during a typical 90-minute sleep cycle.
NREM ( nonrapid eye movement)
Lighter sleep is characteristic of ? when a person is more easily arousable.
stages 1 and 2, NREM ( nonrapid eye movement)
involve a deeper sleep called slow-wave sleep, from which a person is more difficult to arouse
-Called slow-wave sleep.
Combined stages 3 and 4 NREM ( nonrapid eye movement)
sleep is the phase at the end of each 90-minute sleep cycle.
-Stage usually begins about 90 minutes after sleep has begun.
REM (rapid eye movement)
decreases the last sleep stage
Hypothyroidism
causes people to take more time to fall asleep.
hyperthyroidism
which occurs before sleep onset
- CNS disorder.
- risk of lower levels of iron, pregnancy, renal failure, stress, diet, Parkinson’s disease, or a side effect of drugs
restless legs syndrome (RLS)