There are those situations where losing something actually means you gain something (in whatever metaphoric way you look at it). This one, however, is not one for the better.
When you lose sleep, you are more likely to gain weight. Though you would think that staying up later and longer means you are burning more calories, you actually are more likely to put on unhealthy weight from being deprived of sleep. Studies show that people who average 5 hours of sleep a night, in comparison to those who average 8 hours a night, are more likely to put on more weight for reasons of eating more and fatigue.