I keep getting bites, but what from?

Okay, when I nap on my couch and wake up, about 2 hours later I have these whelps on my legs and hips, sometimes under my arm. They ITCH like crazy. They first ones I noticed about 2 weeks ago are still there. They aren't as inflamed, but you can see little red marks. My first notion would be Bed Bugs, BUT I have looked for them and see nothing! I don't see the bugs at all. I have really looked? When I look at bed bug bite photos, they Do look like my bites, but I am wondering if anybody knows of another insect that could also cause these itchy bumps??? It's def. happening inside the house.