My college kids are having a problem with a certain bug in the bed. It does not look anything like a bedbug. It does not bite. It looks like a tiny black piece of thread that is about 1/8th of an inch long with very tiny wiskers. It really looks like a piece of lint or something on the sheet but if you try to touch it, it will quickly move. We thought that it was possibly a flea, but we have bombed each room, and sprayed all of carpets with flea spray more than once, however, every time we think they are gone, one or two show up again. Any idea as to what we are dealing with?? We live in south Louisiana and the feas are really bad right now.....but neither one of the kids has had any bites.