You don't just burn calories while you are awake and moving. Studies show mental activity comprises about 20% of your resting metabolic rate, or the calories you burn without physically moving.
Your brain continues to do this while you sleep. In fact, your brain is working just as hard during REM sleep as it is while you’re awake.
People can burn anywhere between 300 and 700 calories each night but the exact number depends on a range of factors, including your body's Basal Metabolic Rate and the quality of your sleep. Sleep expert Jasmin Lee at eachnight.com says there a few steps to determining the number of calories you burn while sleeping.
