Post Date: 2/8/12 12:54 am Melatonin. One half to one milligram would be an ok starting dose. Find it in the vitamin aisle at most grocery & drug stores. Some people also take benadryl, which is a common ingredient in most over the counter sleep aids, but it can make you feel hung over. If not working, go see your PCP, hormonal changes post op can really disrupt sleep cycles, and there is no shame in asking for a prescription to help you sleep. I'm chuckling a little cuz I'm working the night shift talking about sleep....go figure!!