When I was a teenager, someone I had a crush on paid me a visit. I fell asleep on the couch, and managed a really loud snore which woke me up abruptly. Then I tried to fall back asleep and promptly fell onto the floor, which was doubly funny and embarrassing because I'd never done either of those things in my life
My husband sometimes opens his eyes and converses with me while he's asleep. We'll be having a perfectly normal conversation, and after several minutes, he'll might suddenly jump up and yell "Strike!" while performing the appropriate baseball gesture

.
Now, I make him say the alphabet or something before joining any night discussions. Sometimes, he'll look frustrated and swear he's awake, then I'll realize a bit later that he really isn't.