Sleep-Wake Cycle Flashcards

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1
Q

Duration

A

Three stages of NREM, one REM stage

Approximately 4-6 sleep cycles per night

Approximately 90 minutes per sleep cycle

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2
Q

NREM1

A

Transitional period between wakefulness and sleep

1-7 minutes

Heart rate decreased, muscles relaxed

Eye movement slowed, stops when asleep

If uninterrupted, moves to NREM2

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3
Q

NREM2

A

Light nonREM sleep

Eye movement sleeps, muscles continue to sleep (occasional twitches)

20-40 minutes

Heart rate starts to slow

Repeated 10-25 minutes, increasing in length with every repetition

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4
Q

NREM3

A

Deep nonREM sleep

Minimal eye movement

Muscles at most relaxed

20-40 minutes

Heart rate continues to decrease

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5
Q

REM

A

Rapid eye movement, visual information not transmitted to brain

Temporarily paralysed (atonia) except for eye and breathing muscles

10-60 minutes

Heart rate increases to match rate when awake, varies with dream content

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