I don’t like it when one-night stands spend the night, but I can't tell a girl to get the hell out after having sex. What do girls expect when it comes to one-night stands?
A warm shelter to sleep in to pass the cold, dark night, and a sip or so of water is usually the expectation here. If this is inconveniencing you somehow, then stop having one-night stands. The whole point of them is to wake up in the morning to someone that for all you know, you have never seen before, and to subsequently feel awkward and gross. If you really don’t want her staying there, and I'm not even joking about this, fart or puke as much as you can. Hog all the covers. Spill something on her. But be apologetic about it so she doesn’t think you're an asshole. She’ll be so annoyed she won't want to stay. A more mature route would be to say “I forget your name, but I have to get up early tomorrow. Can I call you a cab or walk you home?” Just make sure she gets home safely because after all, she did come all the way there to sleep with you, of all people.