topic 11 - sleep physiology Flashcards

1
Q

what is sleep

A

naturally recurring and reversible biobehavioral state characterised by relative immobility, perceptual disengagement, and subdued consciousness

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2
Q

what is sleep need

A

biological requirement for sleep / minimal amount of rest the body requires to prepare for the next day
- defined by individual genetics, and physiology
- does not change after losing a night of sleep or oversleeping

motivates the creation of sleep opportunity

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3
Q

what is sleep ability

A

amount of sleep an individual can achieve
- approx by total calculated sleep time
- can change from one night to the next depending on life circumstances

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4
Q

what is sleep opportunity

A

amount of time the person makes available for sleep
- time spent in bed
- under conscious control
- can be greatly affected by environmental factors

provides a context for sleep ability to produce sleep and reinforces the methods used to create sleep opportunity in the first place

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5
Q

what is stage I non REM sleep

A

more theta activity, loss of alpha, and vertex sharp waves

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6
Q

what is stage II non REM sleep

A

theta and delta waves, vertex sharp waves, K complexes (vertex sharp wave with a superimposed slow and fast component), and sleep spindles

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7
Q

what is stage III non REM sleep

A

higher voltage delta waves that are 20-50% of the background over time

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8
Q

what is stage IV non REM sleep

A

more than 50% delta slow waves

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9
Q

what is REM sleep

A
  • return of beta activity
  • rapid eye mvmt
  • loss of muscle tone (except diaphragm)
  • dreaming

lasts about 10 min per epoch on average

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10
Q

what is the total REM time over the lifespan

A

diminishes over time
- 8 hours at birth
- 2 hours at age 20
- 45 min at 70

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11
Q

what happens during REM sleep

A

memory consolidation and storing previous day to prepare for the next

less time spent here = more of a fog

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12
Q

how does sleep load change throughout the day

A

low in morning (was just sleeping)
building throughout the day (unloads through sleep)

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13
Q

what are sleep promoting hormones

A

GABA
melatonin
adenosine

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14
Q

what is the natural circadian rhythm

A

24.2-25 hours
natural cycle = a bit longer than 1 day

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