How to have a good night sleep without being interrupted?

These 2 months, Amber has been getting up frequently in the nights, either wanting to drink milk ( her 1st choice! ) or getting water to drink. I have been trying to tired her out during the day or before she sleeps each night but to no avail. It is always a losing battle for me. I am the one who ends up sleeping out of exhaustion. I am starting to wonder whether is this a symptoms of terrible 2. She will be 2 this coming Sept.
I never have terrible 2 symptoms with Ryan. He had always been quiet when young and can often play quietly for a while before falling asleep and of course there is no crisis whenever bedtime arrives. In fact, it is always an uphill task trying to keep him awake. Even til now, he still falls asleep easily.
The difference of the 2 kids. But yet,this is what parenthood is all about, isn't it? I hadn't been out with my friends for a while. I am starting to wonder what was I doing prior to having kids? Sigh! And yet, the kids are adding color to my otherwise monotone life