Jim you're not the only one that likes to drink...The same thing happened with me and THREE times!
First time was with my Ball 3 years ago, the same exactly, fall asleep in erect position on my couch, with the ball on my hands, after a looot of beers. After half an hour of sleep, i opened my eyes, see my hands empty and jumped up like crazy starting searching and moving every furniture in the room, when, after 1 hour of endless searching i go to sit a bit on the couch, remove the little pillow and the ball was coiled there, as nothing has happened... GOD!...i felt so idiot!
Another time happened with my burm but is a big snake and cannot go somewhere that i couldn't find him.
The 3d time happened with my aesculapian snake but not from a nap. I didn't secured the door of her cage and after an hour i saw her roaming slowly in the room, lucky me, i handle every day that snake and is very calm and never moves realy fast
But that's it! I promised to myself, never drink and herp!