STORY TIME!
Okay, this was actually a friend of mine that did this, but it's my favorite sleep-speaking story EVER.
So, a couple of my buddies were at a summer camp. This was back when we were all in middle school. They're sharing a bunk bed. My friend on the top bunk, Boyd, had forgotten to bring a flashlight. So my friend on the bottom bunk, Drew, said he could just wake him up and borrow his if he needed to go to the bathroom or something.
So in the middle of the night, Boyd wakes up to the call of nature. He hops down and nudges Drew. Drew mumbles something. Boyd nudges him again and says "Drew, wake up." Drew then turns over and says, "I know, I know, but I just don't think androids are a good idea! They require maintenance every four hours!" Boyd looks at Drew and says ".....what?" Drew then blinks, looking at Boyd and says, "Oh, Boyd. I thought you were Geordi La Forge."
Drew's a big Star Trek nerd.