We've all been there at some time or another mindlessly scrolling through our phones in the middle of the night and waking up foggy the next day. Sleep isn't simply "time off," but when our body heals itself, our brain processes memories, and our mood is restored. Getting plenty of sleep makes us alert, calm, and prepared to tackle the day. Put yourself to the test with this quiz and find out just how much you understand about sleep and how it keeps us well.
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