What is the significance of moths in spirituality/mythology?

I'm not generally a very superstitious person but I do believe somewhat in signs and omens, especially if the "omen" appears very persistently. Lately I've been having quite a few encounters with moths, specifically dead ones. The first time started when I was in my school bathroom and I noticed a moth that had one of it's legs stuck in the window pane and was flitting around frantically trying to get free, and almost a few days later, I opened my purse and a dead moth slid out. It wasn't crushed or anything, it was perfectly preserved as if someone had put it there, and it looked exactly like the one I'd seen in the bathroom, same coloring and everything. It just struck me as very odd, like how could a moth manage to get into my closed purse and die? Does anyone know the meaning of this?