I have fallen asleep on the can, just in the privacy in my own home though. That'* pretty funny what happened to you. Your buddies just leaving was a great touch
One night a few years back I got ready for bed after a long day. I put my cell phone on it'* charger on my desk next to the keys for my pickup truck, undressed and crashed in bed. Woke up the next morning fully dressed, my cell phone was in my jacket pocket with my truck keys, and my truck was parked in a different spot from where I rememberred leaving it. And to top it off, I hadn't had any beer, liquor, or any other mind altering substances.