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we spend half of our sleep in stage 2

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Spindles happen in stage 2, and they are little bursts of brain activity.

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-There are four stages of sleep plus REM

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REM is a paradoxical sleep.

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hallucinations occur in the NREM-1 stage

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Night terrors occur in the fourth stage

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growth hormones work the most during sleep

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hypnagogic images appear during stage 1

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Hallucinations appear during Stage 1

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Stage 3 is the transition to deep sleep; spindles are replaced with delta waves

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Alpha waves transition to delta waves as you move up the sleep ladder

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As people age, it is more common for them to wake up during the night.

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all of the stages of sleep take place in a 90 minute cycle