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sleepwake cycle

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sleep-wake cycle

  [sleep-weyk]
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–noun
Physiology. the species-specific biological pattern of alternating sleep and wakefulness, in humans roughly 8 hours of nocturnal sleep and 16 hours of daytime activity.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Waking up at 2AM?
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GetSomeSleep.com
Sleep Cycle
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Health.com
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Sleep Cycle
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www.sleepawake.com
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