I sat my two kids down and explained that once in bed, they may get up to use the restroom or get a drink of water and that is it. ( i have a little cup in the bathroom that they use to get a drink from the faucet.) I explained that the only acceptable reason to wake anyone else up in the house is if they are sick or the house is on fire, otherwise if they are awake & can't sleep, then they are to play quietly in their room in bed, but no turning on the lights. They do have permission to wake us once they see sunlight coming in the window and that is how they know that they can get up and it is no longer sleeping time. For the first week after this talk, I would explain how there was no sunlight, so it was still sleeping time, etc.. Then after the week, I told them both that they now knew the rules and if they continued to break them, there would be consequences. In our house, I have the kids "pay a fine" with a toy. they get to pick the toy. It cleans out their toy box, they loose something, and they go with me to donate it and learn about charity. So at night, if they wake me, i ask are you sick? fire? etc... & if no reason (my son woke me the other night and a mylar balloon had broken free from our dining room and had travelled into his room by air flow from the air conditioner and of course it was noisy woke him, scared him, etc... I did not make him pay the fine of course,) but otherwise I let them know that tomorrow, they will owe me a toy. i then take them back to bed. Then the next morning, I follow through & they have to put a toy in the donate bin. After a while, they figure it all out. i let mine get up and pee & drink all they want, but after about the 3-4 time I let them know that each trip while i'm still awake will start to cost them toys & that stops them. They always are going to push the limits. After awhile mine figured out that while they were staying up late going back & forth, in the end, they really didn't get anything out of it, but tired from lack of sleep. Just be consistant and patient and she will figure it out. they are just curious as to what happens after they go to bed and once they realize nothing interesting, then it should get easier. Best of luck.