My wife takes it... not regularly, but perhaps 5-6 times per year, to deal with sleep issues. From what I can tell, there's no real side effects for her - she gets a decent sleep, and is refreshed. I took it 2x about 10 years ago - first time was... a bit spaced out after I woke up. Second time a few nights later I had probably the most horrific nightmare I'd ever had. Never touched it again.