Would it not be easier to not drink so much caffeine late in the day? Unless you're jetlagged, there's not much evidence AFAIK that melatonin will induce sleep better than a placebo.
Not OP, but I’ve had horrible sleep over the past year. I had taken melatonin a while back before stopping, so on a whim, I decided to bite off a bit of one of my old 5mg pills before sleep. Didn’t give it any second thought — didn’t even think it would do anything. But I slept like a baby for the first time in months. And it’s completely reproducible.
