ScienceDaily (Apr. 4, 2008) — Both short and long sleeping times predict an increased risk of future body weight and fat gain in adults, according to a new study. The study, authored by Jean-Philippe Chaput, of Laval University in Quebec, Canada, focused on 276 adults between 21-64 years of age, whose body composition measurements and self-reported sleep duration were determined. Changes in fatty indices were compared between short (five to six hours), average (seven to eight hours) and long (nine to 10 hours) duration sleeper groups.ScienceDaily (Apr. 4, 2008) — Both short and long sleeping times predict an increased risk of future body weight and fat gain in adults, according to a new study. The study, authored by Jean-Philippe Chaput, of Laval University in Quebec, Canada, focused on 276 adults between 21-64 years of age, whose body composition measurements and self-reported sleep duration were determined. Changes in fatty indices were compared between short (five to six hours), average (seven to eight hours) and long (nine to 10 hours) duration sleeper groups.