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It’s not necessarily laziness that makes people hit the “snooze” button in the morning. Most likely, your body clock is mismatched with the demands of your life.

Your clock is controlled by the suprachiasmatic nucleus, a part of the brain that controls the body’s biological rhythms. But, says Jean Matheson, a sleep-disorders specialist at Beth Israel Medical Center in New York, these preset natural rhythms often don’t align with daily realities—work or school start times cannot be adjusted to fit a person’s sleep schedule.