I've been taking it for many years off and on... depending on pain levels, I might take one every night for weeks, or only need to take it a couple days a week. As others have said, it can cause some memory issues and drowsiness if you don't get the 8 hours sleep. It does work fast, I haven't had a problem with addiction, but do notice some memory issues. I have heard of people actually doing things, or actually walking places and not remembering... sort of like sleepwalking. For a one-time use for a supervised sleep study, I'd take it and wouldn't think twice...