Not OP, but I've been using melatonin every night, no exception, and it's been very helpful. I use a much lower dose (between 0.3mg and 0.5mg), and it's worked completely fine, so I would suggest that you start very low and only increase if you really need it.
+1 to 0.3mg, larger doses can lead to nightmares and other issues.
It also may take longer to have an effect than is commonly said. For me, it's ~3-4 hours. I'm a natural night owl but 0.3mg melatonin at 6pm has me falling asleep on the couch at 9:30-10pm.
