I used to have a real problem with this, so I've got some awesome stories to share.
I've woken up on a couch on the second floor of our hours many times. I sleep on the first floor (basement).
I've ended up getting dressed and waking up on that couch on multiple occasions as well.
I've woken up wearing a shirt I have no memory of putting on. It was backwards.
I've apparently turned the tv on and laid down on the couch in the basement.
And the best of all, I woke up, walked up the stairs, walked into my parents room, and asked for help with Tomba. Tomba, for those who don't know, is a Playstation game. One that was crazy awesome.