Insomnia affects between 40 and 80 percent of overweight and obese men, said Serge Brand of the Center for Affective, Stress and Sleep Disorders at the Psychiatric Clinics of the University of Basel in Switzerland, who was not part of the new study. Regular aerobic exercise training reduces sedentary time, reduces appetite, improves cardiovascular performance and increases self-esteem and self-efficacy, Brand told Reuters Health by email. It also increases sleep need for recovering and improving body tissues such as muscles, tendons, and organs related to respiration and blood flow, and it improves mood, he added.