You burn more calories when you are in a deep sleep than when you are just lying reading in bed or tossing and turning. Nighttime calorie burn is dependent on REM or rapid eye movement sleep. When you are in REM sleep, your brain is highly active; sometime more active than when you are awake.While sleeping…”. Someone who weighs 150 will scorch 95 calories per hour at least, and if you weigh 115 you will burn 42 calories in that exact hour. Calories burned during sleep are used to maintain essential functions in the body.