Really, I'm not kidding.
(I know, it does sound crazy though but . . ) I go out at night and pick nocturnal bugs off my flowers all the time. If there are raccoons around, I make a regular patrol of the yard at midnight before I go to bed. It discourages them most of the time, and they take my yard off their nightly tour.
If you don't know what the culprit is, you can't figure out how to combat it. Catching the varmint in the act is the way to go.