Until now, there has been scant evidence that eating when you should be sleeping might cause you to gain weight. Scientists at Northwestern University studied nocturnal mice for six weeks, split them into two groups, and fed both the identical number of calories in a high-fat diet. The mice that ate during the day (when they are normally sleeping) gained an average of 10 grams compared to 5 grams among those who ate at night (their usual time). This is one of the first studies to provide evidence that eating at the "wrong" time might lead to weight gain--at least in mice!
PositiveTip: Avoid those late-evening snacks while watching television or working late--they might add more pounds than you expected!