Tom, I try to not drink much just before going to bed. If you gotta go, it's hard to get back to sleep rationalizing you can make it until morning. On a trip a few years ago with Eric from HighSierraTopix, the first night not only did I get up at midnight, I had to do it again at 6AM. That trip, the first day going in, I didn't have enough water going in, so tried to make up for it at camp. Wrong approach. Standing outside in my shorts in the cool temps, got me shaking something fierce. Plus, my silk sleeping bag liner somehow got stuck in my shoes, so it got drug outside while I peed, when I turned around, I was wondering what in the heck it was.:)
Duane