 CAMBRIDGE, Mass.--BUSINESS WIRE--Sage Therapeutics Nasdaq:SAGE, a biopharmaceutical company committed to developing novel therapies with the potential to transform the lives of people with debilitating disorders of the brain, today announced participation in the first-ever Mental Health Action Day, on May 20, convened by MTV Entertainment Group and including more than 1,300 leading brands, nonprofits, government agencies and cultural leaders. Mental Health Action Day is an open-source movem 