I was having sex with my ex-wife in the missionary position and our yellow lab jumped up on the bed and started rimming me. Freaked me out even worse because I didn't notice him get on the bed so I had no idea whose tongue was in my ass!!!
I have fallen asleep during BJ's and sex with many women (never a provider) over the years. Although it's more like passed out then "sleep". I've even woke up naked next to a few and have no idea how I got there or if we even had sex.