Wang D, et al. - In this meta-analysis, experts evaluated the dose-response connection between sleep duration and risk of osteoporosis. A U-shaped relationship was seen between sleep duration and risk of osteoporosis, with the risk of osteoporosis being the lowest at about 8-9 hours per day of sleep duration. Findings suggested that in the middle-aged and elderly adults, a correlation of both short and long sleep duration with a significantly increased risk of osteoporosis was noted. Delay or prevention of osteoporosis could be helped by appropriate sleep duration.