Melatonin doesnt work! 172 pts w/ unilateral TKA for Rx in DBRPCT trial of qhs 5 mg melatonin vs. 125 mg vit C placebo for 6 weeks. No differences in PSQI or other sleep measures @6wks. Poor sleep assoc w/ worse pt function and pain. https://t.co/b1gfnyB7Qw https://t.co/nT589CItIF