Oh, they're probably sugar ants. I had the same problem. If you can, use bug spray, but if not, then get a shallow bowl, put some sugar in it, and make sure to add a table spoon or two of baking soda (keep it out of reach from any pets). The baking soda will kill the ants within a few hours, and within that time they'll have tasted the sweet sugar, bring it back to their queen, the queen will eat it, and she will die as well which means the entire population of ants in your room will follow the same fate.
Hope that helps!