Sleep stages

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9 Terms

1
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REM stands for

Rapid eye movement

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Total sleep % of REM for adults

20 - 25%

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REM sleep

  • Body is paralyzed but brain is most active

  • Vivid dreams occur and are more likely to remember

  • Internal body is active external is shut off

  • Paradoxical sleep

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NREM stands for

Non rapid eye movement

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Total sleep % of NREM for adults

75 - 80%

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NREM sleep

  • Body is recovering

  • 3 stages

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N1

  • Light sleep

  • Easily awoken

  • 1 - 7 minutes

  • Beginning of deep sleep

  • 5% of total sleep

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N2

  • Light sleep for first half and deeper sleep second half

  • Muscles continue to relax

  • Eye movement slows

  • Greatest portion of total sleep

  • 10 - 25 minutes

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N3

  • Deepest sleep

  • Difficult to be awoken from

  • Drowsy if awoken

  • All muscles are relaxed

  • Slow brain waves

  • 20 - 40

  • 15% of total sleep