A loong time ago, I suggested people have the ability
to "investigate" at night. If they do, there's a
chance they see anyone else who is out at night -
wolves, mafia, police, seers(?), angels(?),
illusionists(?), and other people out investigating.
A further extension from this would be the ability for night-timers to not perform their function at night, so they wouldn't be seen out and about. Maybe even to the extent that not all wolves/mafia go out. (If only 1/3 of the wolves go out hunting, there's only a 33% chance they succeed)
Eric swift the all-seering