nature of sleep

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Nature of Sleep: Ultradian Rhythm
The sleep stages are an ultradian rhythm because they take 90 minutes. In a night’s sleep a person will go through 4-5 NREM/REM stages.
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Nature of Sleep: What?
As a person falls asleep their brain waves become larger in amplitude and slower as they go through NREM stages 1-4.
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Nature of Sleep: Stage 1?
Brain produces theta waves (5-7 Hz) and they are easily woken.
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Nature of Sleep: Stage 2?
K Complexes occur which are large spiky waves. Sleep spindles also occur.
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Nature of Sleep: Stage 3?
Large slow delta waves occur- deeply asleep.
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Nature of Sleep: Stage 4?
Delta waves dominate the EEG.
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Nature of Sleep: REM?
After 90 mins of NREM, REM begins. The EEG resembles the waking state and brain appears active. Brain waves are fast, de synched and low voltage.
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Nature of Sleep: REM cont?
The person’s eyes move rapidly but all other muscles are paralysed. Vivid dreams occur. Body temp stops regulating.
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Other cards in this set

Card 2

Front

As a person falls asleep their brain waves become larger in amplitude and slower as they go through NREM stages 1-4.

Back

Nature of Sleep: What?

Card 3

Front

Brain produces theta waves (5-7 Hz) and they are easily woken.

Back

Preview of the back of card 3

Card 4

Front

K Complexes occur which are large spiky waves. Sleep spindles also occur.

Back

Preview of the back of card 4

Card 5

Front

Large slow delta waves occur- deeply asleep.

Back

Preview of the back of card 5
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