states of consciousness (module 16-19) Flashcards
sleep
a periodic, natural loss of consciousness
circadian rhythm
-our biological clock that operates on a 24 hour cycle
-wakefulness and temperature
how long does the sleep cycle last
90 minutes
REM sleep
-rapid eye movement sleep
-vivid dreams occurring during this stage
-genitals become aroused
why is REM sleep also known as paradoxical sleep?
-motor cortex is active but it’s messages become blocked by the brainstem
-muscles are relaxed even though our other body systems are active
alpha waves
relatively slow brainwaves of a relaxed and awake state
NREM sleep
-non-rapid eye movement sleep
-encompasses all sleep stages except REM
hallucincations
false sensory experiences such as seeing something in the absence of an external visual stimulus
hypnagogic sensations
bizarre experiences such as jerking or a feeling of falling or floating weightlessly while transitioning to sleep
delta waves
the large slow brain waves associated with the deep sleep of NREM3
NREM-1
-experience hallucinations and hypnagogic sensations
-alpha to theta waves
-lasts 5 to 10 minutes
NREM-2
-experience sleep spindles
-spend half of your night here
-theta waves
NREM-3
-deep sleep
-delta waves
-lasts about 30 minutes
sleep spindles
periodic bursts of brain activity during NREM 2
suprachiasmatic nucleus
-pair of cell clusters in hypothalamus that controls the circadian rhythm
-in response to light, SCN causes pineal gland to adjust melatonin production, affecting our feeling of sleepiness
sleep patterns are influenced by…
genetics
being bathed in light or deprived of light will..
disrupt our 24 hour clock
in the absence of light the SCN will cause…
the pineal gland to produce melatonin, causing feelings of sleepiness
why do we sleep?
-sleep protects
-sleep helps us recuperate
-sleep helps us restore memories
-sleep feeds creative thinking
-sleep supports growth
ultradian rhythms
occur more than once a day
infradian rhythms
occur once a month or a season
sleep deprivation
-increases ghrelin a hunger hormone and decreases leptin and hunger suppressor
-decreases metabolic (energy use) rate
-increases production of cortisol
-enhances limbic brain responses at the sight of food
insomnia
recurring problems in falling or staying asleep
nacrolepsy
sudden attacks of overwhelming sleepiness
sleep apnea
stopping breathing repeatedly while sleeping
sleepwalkin
-doing normal waking activities while asleep
-sleepwalking occurs in NREM3