Funny this came up. Before I started sleeping in a hammock, I NEVER had to get up in the night EVER! Now that I sleep in a hammock every night, I usually have to get up at some point, not every night but more often than not. When I slept in a bed, I was usually on my stomach and that's almost impossible in a hammock, maybe that's why? Not sure. Doc says there's nothing wrong physically.
I hate getting up in the middle of the night while camping though...there's CREATURES out there!