L6 Flashcards
(27 cards)
ducks and sleep
sleep with one eye open. contralateral brain active.
3 functions of sleep
limbic system controlled by frontal lobe normally. less inhibition during sleep.
complex problem solving: “sleep on it” - brain works thru problem when asleep. other areas shut down so brain can focus on this.
memory consolidation.
5 stages of sleep
stage 1: theta - low frequency. drowsy, light sleep.
stage 2: harder to wake up sleeper than stage 1, still light sleep tho. see sleep spindles and K complexes = large, slower fluctuations in amplitude
stage 3&4: 3 = beginning of deep sleep. 4= within deep sleep. both = delta wave high amplitude, low frequency wave lengths. rejuvenating/energy replenishin.
REM: rapid eye movement. a lot of brain activtiy. when woken up report dream 80% of time. when woken up in other time report dream 15-50% of time.
awake brain waves
beta waves = low amplitude. awake, alert, paying attention
alpha waves = drowsy, relaxing. lower in frequency.
delta wave =?
stage 3/4 = high amplitude, low frequency
beta wave =?
awake, alert, paying attention. low amplitude
alpha wave?
drowsy, relaxed. vegetating. lower in frequency.
Newborns do REM how much?
average time sleeping for 15-24 year olds?
elderly?
- 2 the time sleeping is REM
- 8.5 hours.
- 6.5 hours (higher stress hromones = harder to sleep)
sleep depends on what factors?
age, gender, health, activity during the day.
dreams in rem vs non-rem
rem = legg logical. maybe bc limbic system most active.
typical nights sleep
majority of deep sleep occurs early. peak and trough in sleep. throughout the night deep sleep decreases, REM increases
sleep deprivation - how long?
- day 5/4 symptoms?
- back to sleep schedule?
264 hours.
- disoriented, slurred speech, memory problems.
- back to regular sleep schedule after a week
rats and sleep
sleep is essential = rats deprived die within 21 days.
symptoms of sleep deprivation. REM vs stage 3/4
REM deprived = psychological effects. irritation, mood, affects, aggression
Stage 3/4 deep sleep: physical effects. slowed reaction time
what is alarm clock sleep-peep cycle
trying to fall asleep, but keep checking phone to see how long you can sleep for, mind racing.
CNS during deep sleep
SNS shuts down, PNS takes over.
- glucocort levels decrease
what is delta sleep-inducing factor?
corticotropin-inhibiting hormone SUSPECTED to be released by hypothalamus to suppress HPA by suppressing ACTH therefore decrease stress hormones
CNS during REM sleep
sns and glucocorticoids increase
one hour before waking up - hormone levels do what?
CRH, ACTH, and glucocorticoid levels rise. = natural sleep patterns allow you to wake up.
sleep deprivation and CNS
no decline in glucocorticoids; levels actually rise. because not sleeping is stressful on body and brain.
- decrease energy stores in brain = interfere with memory consolidation/working mem.
study: brain scans in sleep deprived vs non-sleep deprived
sleep deprived: more local areas of brain active, irrelevant areas active. not deprived: only specific areas active
shift/night work: stress & sleep.
2 weeks day shift/2 weeks night shift = constantly retrain circadian rhythm = harsh on body, bad sleep == not as good sleep during night shift bc sleep during day which is opposed to day time.
overactive stress response
flight attendants: stress and sleep
impaired explicit memory when sleep deprived/circadian rhythm is messed
- higher glucocorticoid levels
smaller temporal lobe (=hippocampus measurement)
sleep deprived + type 2 diabetes
sleep deprived = increase stress hormones => higher incidence of type 1, higher cardiovascular disease, explicit memory issues.
- increasing sleep deprivation = contribute to chronic conditoins
- using artificial lights - less time spent with them than before them.
