Psychologists at Baylor University monitored the sleep patterns of about 60 people between the ages of 18 and 30.
Half of them spent five minutes writing to-do lists before they went to bed. The other half made a list of all the things they'd accomplished that day.
And the ones who made to-do lists fell asleep nine minutes faster. Which might not seem like much, but it's on par with what some prescription sleep medications can do.