Yeah, the glow worms love the rain (and warm) as well. Seeing lots of those guys this week.
As far as hallucinogens go, I can assure you that we are not making this up, lol. This place seems to be a magnet for lightning bugs, the first year we were here we were blown away by how many there were, and a lot up high along the trees too. So we've studied up a little and have tried to keep a nurturing environment for them.
I think I've posted about the early ones in the past, it started about 4 or 5 years ago. One or two show up around the 10th of May or so, and do their thing. Seeing one flash one time doesn't really count, you need to verify by seeing it flash a few times, to make sure it's not a plane on the other side of the trees.
So right now it's early bird season, and most years they'll disappear a few days before the main crew shows up, although there has been at least one year where there was continuity. That's when you see one one night, 2 or 3 the next, then 4 or 5, then you stop counting. That usually starts around the 25th of May here give or take. Looking forward to it!