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According to research from the University of Colorado Boulder, people who used their weekends to catch up on sleep gained more weight and showed declines in insulin sensitivity compared to those who got a regular good night's sleep. Their study was  published Thursday in the peer-reviewed journal Current Biology . The study featured 36 adults asked to stay at a research center for two weeks on the University of Colorado campus. They were split up into three groups: one group allowed to sleep nine hours a night, a second group restricted to five hours of sleep nightly, and a third group given five days of five-hour sleep nights followed by a "weekend" where they could sleep as long as they want. After the two days, they returned to their five-hour-a-night sleep schedule. During a nine-day period, participants' sleep, exposure to light and food intake were monitored closely, say researchers. The groups with less sleep snacked more at night, gained mo...