I'm trying to understand what the mechanism is for melatonin to aggravate the odds of getting an aneurysm or affecting an aneurysm you have already had. What's the adverse connection between aneurysms and melatonin? I'm certainly not saying you should, but melatonin is a naturally occurring hormone that peaks during the early part of a person's sleep cycle. I did a web search on it, but nothing popped up.