Cat Takes Over Bed

So everyday that I come home from school my cat is sleeping on my bed. She doesn't seem to care if its made or not, or if there is a mountain of clothes on it. She just sleeps on it like there's no tomorrow while she continues on taking over my bed. And forget me trying to actually fit on the bed too, people may think cats are small, but they could actually take up an entire bed and leave you no room. I'll just have to wait until she wakes up... or stick her in my sisters room =].