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A preliminary study from Brigham and Women's Hospital, Harvard Medical School, showed that yoga may help individuals with insomnia. During the study, participants with chronic insomnia did yoga daily. They also kept sleepwake diaries over a 2-week baseline period and a 8-week subsequent intervention. A comparison of pretreatment and end treatment found that 20 participants exhibited major improvements in sleep efficiency, total sleep time, total wake time, sleep onset latency, and wake time after sleep onset.