Functions and Phases of Sleep

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Describe the functions and phases of sleep

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Learn more about sleep by visiting the Sleep Foundation website.

"How sleep works" timeline at

Take the sleep IQ quiz

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Listen to the Neuroscientist Russell Foster talk about the role of sleep.

Russell Foster: Why do we sleep? Video on

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Get a deeper understanding of brain activity levels during each sleep phase – read this page from to learn about alpha waves, delta waves and sleep spindle activity during REM and nREM sleep.