My cat keeps waking me up too early in the morning?

I have a two year-old cat that every night at about 5 am jumps on my bed, meows at me, and starts biting my hand to wake me up and either feed her or play with her. I realize cats are nocturnal, and I realize this situation is my fault, but how can I re-train my cat to leave me alone? I tried leaving extra food in her bowl and that didn't work. I also tried leaving her outside of my bedroom and closed the door, and all she does is meow incessantly (the longest I tried to ignore her for was 30 min!!). I also tried the water spray trick, but she runs off and then comes back, which also wakes me up. Any help? I really miss having a full night sleep....