I hate that feeling when you have to go, but it is almost time to get up and you have to decide if you want to get up and then come back for like a half hour, if you want to just get up and stay up, or if you want to try and power through (which ends up leaving you awake anyway usually). I'm sorry about you falling out of bed. We got some higher thread count sheets a while ago and my wife didn't like them because they were so slippery. I guess we are just destined to be plebians!
I get it, sleeping right through is glorious. What's not glorious is landing on the floor in a heap of flesh and bones...I'm hoping I don't do it again in a hurry. Lol.