A 2004 study published in the Journal of Neuropsychiatry Clinical Neuroscience explored the relationship between acupuncture to insomnia and anxiety. After participating in a five-week acupuncture treatment, participants in the study had an increase in the amount of melatonin in their bodies. Melatonin is a sleep hormone that helps trigger the onset of sleep and keeps you stay asleep through the night. Participants in the study slept longer and woke less often during the night.