A good night's sleep—everyone needs it, but not everyone gets it. We stay up late and get up early, and then wonder why we always feel tired. Why is sleep important? See how much you know about snoozing by taking this quiz.
1. The rapid eye movement (REM) sleep stage is when dreaming occurs. How often does REM happen during the night?
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The correct answer is
REM sleep occurs every 1-1/2 hours while you sleep, the National Institute of Neurological Disorders and Stroke (NINDS) says. During such sleep, the eyes move rapidly under the closed lids.