Canadian cannabis company Cronos Group Inc. CRON, +1.58% is partnering with Aleafia Health Inc. ca:alef ALEAF, -3.57% in a medical marijuana study aiming to improve the management and treatment of insomnia and daytime sleepiness.  The study will be partly funded by Peace Naturals Project Inc., a licensed producer of medical marijuana that is wholly owned by Cronos.  Aleafia is a medical marijuana company that is focused on patient care from "seed" to "sale" with more than 50,000 patients.  Canada is preparing to fully legalize cannabis for adult recreational and medical use on Oct. 17.  Cronos shares were up 3.6% premarket and have gained 73% in the past month, while the S&P 500 SPX, +0.29% has gained 2%.