K.N.
My son had the same problem last year when he was about 8 months old as well. We did a good amount of reasearch and got the warm mist humidifier(I believe it's made by Viks - I bought it at Target). It seems to work really well. When we go to visit my inlaws for a weekend they had a different one and he would always wake up congested when we wre there. From what we read, the cool mist ones don't work as well but everyone will recommend them for children because you don't have worry about the child burning themselves. We just put ours on top of the bookshelf and even now that he's a toddler he doesn't bother with it.