This article suggests that snorers burn more energy whilst they sleep. Apparently people who are heavy snorers burn around 373 extra calories a day compared with those with only mild symptoms. Scientists studied the link between weight gain and sleep apnoea and looked at 212 patients. On average the volunteers burnt 1,763 calories a day, whilst those with the worst symptoms burnt 1,999. The extra calories amount to the same amount that you would burn if you did a 30 minutes work out in the gym.