little friends

I have an ant problem. OK so I know I should try to keep my house a little cleaner... especially the kitchen.. But here is what baffles me- There are NO ANTS where the traces of food are. The ants are actually in my bedroom. NS and I discovered this one night after getting in to bed only to be bitten. He has three- I have 13! It seems that the little buggers are crawling out from under the carpets along the walls and crawling up the side of our bed. So I spent the entire night cleaning up the bedroom and vaccuuming the ones I could get and then went to walmart to buy ant traps. I don't understand why they would be in the bedroom because we don't take food in there. My only guess is that they may have been retreating from rain? (it had rained the day before for about 12 hours on and off and into the night causing up to miss the meteor shower!!)