I would usually think a thing like this is a random thing; an isolated incident. But I've experienced this before as well. For me, it has happened after abstaining from O for awhile. And most of the time, we're talking wet dreams here, it would be with a female member of the family. Mostly it has been step sisters, step mother, or in-laws, but I too wonder why the association with the family. Puzzling to be sure.