Can Exercise Be Harmful For You? We all know that exercise can surely boost the quality of sleep. But what about intense exercise? Is it good or bad for your sleep? Well, a new research found that intense workouts may gradually decline the quality of sleep. The same research says that people who intensely workout need to consume more carbs to minimize the effects of exercise on sleep. The study was conducted on 13 people who were allowed to embrace intense workouts during the tenure. Apart from the quality of sleep, researchers also kept an eye on the moods of the participants and their average performance.