sleep evolve Flashcards
what happens to HB BP and respiration during sleep
heart rate slows down by 10 or 20 per minute and BP and resperations deacrease
Rapid eye movement (REM) sleep occurs during
deep sleep
REM is associated with
altered vital signs, muscle relaxation, increased cerebral blood flow, and steroid release
During non–rapid eye movement (NREM) sleep
physiologic activity is reduced; brain waves, breathing, and heart rate slow; and blood pressure drops
sleep is regulated by
reticular activating system (RAS) and neurotransmitter interactions
The most familiar rhythm is the
day-night, 24-hour circadian rhythm
diurnal means
active during the day
nocturnal means
most of their activity during the night
Humans are normally considered to be
diurnal
who controls the 24 hour circadian rythms
Nerve cells
what affect the sleep cycle
daily routines, work schedules, social commitments, alarm clocks, noise, light–dark cycle
Humans spend approximately ? of their lives asleep
one-third
Polysomnography is
the recording of brain waves and other physiologic variables, such as muscle activity and eye movements, during sleep
A normal polysomnograph shows a sleep sequence of ________ NREM stages and ____ REM stage
three, one
a normal sleep pattern consists of how many cycle of sleep
three to five
Quality of sleep is affected
frequent wakening, pain, and shortened REM stage of sleep
The usual sleep sequence for a person
rapid progression through NREM stages 1 through 3, back through NREM stage 2, and then into REM sleep
REM sleep lasts
up to 45 min
stage 1NREM characteristics
- Lightest level of sleep, between sleep and wakefulness
- Vital signs and metabolism begin to decrease/slow down
- Easy arousal by external stimuli, such as noise
- Feeling of drowsiness
- Lasts a few minutes
- May occur during the day as “resting my eyes”
NREM stage 2
- Relaxation increases
- Sleep becomes deeper
- Snoring may occur
- Relatively easy arousal
- Physiologic functions continue to slow
- Accompanied by occasional small muscle jerks
- Lasts 10–20 min
NREM stage 3
- Deepest stage of sleep, called slow-wave or delta-wave sleep for the type of brain waves seen during this type of sleep
- More difficult arousal and rare movement
- Muscles relaxed
- Vital signs decrease, but regular rhythms/patterns maintained
- Restorative processes (such as the release of growth hormone) occur
- Sleep walking, somnambulism, and nocturnal enuresis may occur
- Strong stimuli needed for arousal
- Amount of time spent in slow-wave sleep depends on how long since a person slept
- Lasts approximately 30–60 min
last stage REM
- Occurrence of vivid, colorful dreaming (less vivid dreaming may occur in other stages)
- Starts approximately 90 min after sleep is initiated
- Autonomous response causes rapid eye movements, fluctuating heart rate and respirations, and increased blood pressure
- Muscle tone decreased
- Gastric secretions increased
- Very difficult arousal
- Duration of REM sleep increases with each sleep cycle and averages 20 min
what age group requires the most sleep
Newborns
what age group requires the least sleep
older adults