I also work in a detached garage. I used to get bombarded with flying insects at night. I was finally forced to take action when a GIANT carpenter bee flew past the flame singing it's wing, then proceeded to buzz frantically around the worktable. I was in the middle of a bead, of course, and had to water anneal the bead so I could put the poor thing out of it's misery all the while terrified that it might sting. I now have a screen on my garage door
(I still don't know if this kind of bee can sting)