Yoga In 2004 Applied Psychophysiology and Biofeedback published a study which showed that 8 weeks of yoga significantly improved sleep efficiency, total sleep time, total wake time, sleep onset latency and wake time after sleep onset in 20 insomnia patients. [Source] Meditation In 2014 Sleep published a study in which 54 adults with chronic insomnia

Myofunctional Therapy In 2015 Sleep published a meta-analysis of 9 studies involving 120 patients which found that myofunctunctional therapy reduced sleep apnea severity by 50 percent in adults and 62 percent in children, with improvements in snoring, sleepiness and oxygen levels in adults. [Source] Dronabinol – Man-made cannabis In 2013