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The billions of neurons and the trillions of connections between them in each of our brains keep changing with every experience, even when we sleep.
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This is a condition that causes the sudden onset of sleep paralysis the loss of muscle tone that occurs when we sleep during waking hours, often as a result of strong emotions.
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"When we sleep, India works, " says Brighton.
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DeBakey VA Medical Center in Houston, says our pain threshold goes down when we're sleep-deprived.
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So while we are moving, we will just wear wind-proof clothing, and save the big warm clothing for when we stop to eat and sleep.
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The research team took fruit flies and removed several genes that regulate their internal biological clock, which, in humans, decides when we wake up and go to sleep.
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When we did get to bed, sleep was difficult.
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When we were there, 45 children turned up needing somewhere to sleep.
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When it comes to work, we live in a society that values the lack of sleep.
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