AP Psychology 1.4 States of Consciousness

Sleep spindles... those are what did in Sleeping Beauty, right? Not quite, but are a pretty important part of your beauty sleep.

APAP Psychology
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Transcript

00:23

alright first things first if a sleep spindle isn't a magic green glowing

00:27

wheel then what is it well it's actually a burst of rhythmic brain activity

00:31

generated in the thalamus and it's believed to represent brain activity as

00:35

it attempts to block out potential causes of being awoken in an effort to [Boy sleeping on desk]

00:38

allow the body to enter a deeper sleep kind of like hiding under your covers

00:42

when your mom yanks your curtains open kind of don't quote us on that

00:46

alright with that knowledge in mind we can safely eliminate stage one which is

00:51

the lightest form of sleep and one from which we can be easily awoken and that

00:55

annoying sense of falling that suddenly jerks you awake yeah that's here too [Sleeping beauty suddenly wakes up]

00:59

this stage last five or ten minutes and contains no sleep spindles it also makes

01:04

us look pretty dumb at sleep overs from there we enter into stage two this

01:08

stage of sleep lasts about 20 minutes the body temperature begins dropping and

01:12

the heart rate slows down all in preparation for a deeper sleep well if [Heart rate monitor appears]

01:16

this sounds like the perfect time for sleep spindles to make their appearance

01:19

then you'd be right this is when the body really wants to gear down for the

01:23

long haul and sleep spindles help assure you aren't easily awoken meaning B is

01:27

the correct answer but no one likes a cliffhanger so let's check out the last [Sleeping Beauty hanging from a cliff]

01:31

few stages well next comes stage 3 when deep slow brainwaves known as delta

01:36

waves emerge this is the true transitional period from light to deep

01:40

sleep and stage 4 otherwise known as delta sleep comes next [Stage 4 sign appears]

01:46

lasting for about a half an hour this is when those Delta waves really come out

01:50

in full force it's also

01:53

typically when sleepwalking and bedwetting

01:55

mostly occur it should be called come on not again sleep but we won't go there

02:00

before going into Stage five however the body will usually go back down into

02:04

three and two before then gearing up through the stages once more [Sleeping beauty appears through the sleep stages]

02:08

and then finally launching into REM best characterised by rapid eye movement and

02:13

that's REM not the rock group increased brain activity and dreaming REM sleep is

02:18

easily the most action-packed part of any sleepers night once REM ends the

02:24

body gears back down to stage two before starting all over again and how [Woman sleeping and gears turn]

02:27

convenient because Stage two was our answer all along though stage 2

02:32

sleep spindles doesn't sound quite as action-packed it sounds like a movie

02:36

we'd only watch if Vin Diesel were in it yeah maybe maybe not [Woman walks out of theater]