http://www.thelancet.com/journals/lanpsy/article/PIIS2215-0366(17)30328-0/fulltext?elsca1=tlpr
In the largest randomized control trial for mental health, researchers discovered a link from insomnia to paranoia and hallucinations. Successful treatment of insomnia cut paranoia and hallucinations by around half. While the researchers don't extend similar links as existing outside the studied population, the correlation is quite clear and strong that treatment of insomnia could lead to improvements in other mental health symptoms in other populations.
(Score: 2) by Geezer on Saturday September 09 2017, @10:52AM
Gregory House said it best, albeit in a fictional setting.
https://www.youtube.com/watch?v=xY-WXYIiHWA [youtube.com]