Four types of exercise may be the best ways to improve sleep quality and avoid insomnia: yoga, Tai Chi, walking, and jogging. A new meta-study — a study of other studies — found that for people seeking better sleep, yoga, tai chi, walking, and jogging rivaled cognitive behavioral therapy for insomnia (CBT-i) in effectiveness. While authoritative statistics on insomnia worldwide are elusive, the latest research suggests that 16.2% of the global population suffers from the condition, and 7.9%