It's easier to dismiss ghosts in the daylight.

Your ghosts cannot have you, Charles. So exorcize them before I have to.

I'll remember your words," he told her with returned seriousness, though he pictured Anna taking her grandmother's rolling pin after the ghosts who haunted him, and it made him want to...smirk again.

Some people will tell you werewolves can only shapechange under a full moon, but people also say there's no such things as ghosts.