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Just go for it man. She's definitely interested, and you guys already share interests in hobbies. I would say just confront her and tell her you really enjoy her company and want to get to know her even better. You don't have to actually ask her to "go out with you" like your going steady or something, just ask her to the movies or dinner or any other activity you can think of so you guys can share some alone time. Then make a move for the roofies!!!!
Of course I'm kidding on the end there.
honestly, if you're going on that many hours talking to her (minus the 4 hours of sleep) it sounds like she's into you. i'd definately go for it. from what it seems, if she wasn't into you, she wouldnt be talking to you so much, and if you're still not sure about it then just hint it on and see how her reaction is, if its positive, then i think you should take a shot at it, if it's an uneasy/negative response then stay on the friend base for now and try to work your way up! :o)