J.R.
So sorry you are recently single! Assuming you have checked for physical problems, sleep problems are usually behavior problems. Not that she's being "bad," just that she hasn't been trained to do what you want her to do. (Supernanny has a great video on teaching a toddler to go to sleep in his bed.) The positive rewards are a great idea, but I think they will be icing on the cake, so to speak, after the hard work of discipline. If she is in the habit of getting up, she probably won't remember in her half-asleep state that there is a reward waiting for her in the morning. The reason she continues to wake is because she is getting something when she wakes, whether it is a drink or attention or whatever. Do not give her anything or do anything for her when she wakes except take her back to bed - no hugs or kisses, no diaper changes, no talking (except to say "it's time for sleep"), no drink, hopefully you're not potty training at the moment and no potty, no nothing. Every time, without exception, except for sickness or something very unusual. It may get worse first, but be PERSISTENT and CONSISTENT and all of sudden there will be great improvement. Then it will be time to get out the stickers and treats and celebrate in the morning!! After good sleep habits are established, you can be more responsive again, like with hugs and comfort etc., to an occasional midnight wake-up.