I'm An RN Who's Worked For 43 Years In Med

I'm an RN who's worked for 43 years in med surg and psychiatry. I'm trying to remember the name of a med we used go give pre-op patients the night before to "make sure they had a good nights sleep" I was a pretty potent sleeper as I remember, but can't remember the name. Might have been used years ago as well to manage manic patients who needed to be medicated for sleep after several nights of being up.