Totally.
I start nodding my head and closing my eyes, then the next thing I notice is that the hole scene changed and everything's awkward lol
After that I watch it again the next day
There are few times when I am sleepy in the bed watching anime and from the tired I am I drop the cellphone in my face and it wake me up from the heat and smash it causes.
Yup, I was barely conscious and watched two episodes of anime, didn't remember a single thing that happened on that show. It has happened on more than just anime also TV shows.
I got so tired I wound up watching three episodes of an anime and have no idea what i watched ~.~ Ever happen to you???
Haha... I've totally done this a few times. Half nodding, but half awake, but couldn't remember 2-3 episodes back. Just lucky I wasn't driving a car or something.