About 2 calories per minute.
so if you sleep for 8 hours you lose 960 calories..
Does the disclaimer "your results may vary" sound familiar? It should, because it follows nearly every weight-loss commercial (usually in a voice moving at the speed of light). The amount of calories burned depends greatly on the person.
This weight-loss calculator from FitWatch.com asked us to enter our weight and how long we planned to sleep. According to the ensuing calculations, a 160-pound person who sleeps eight hours will lose roughly 549 calories in the process.