I always hate to break up a conversation in this thread with a random thought, but it's about 2 o'clock in the morning and everyone else in the house is asleep except the cats. So therefore I have nothing else to do but let my mind wander from one lightning quick thought to the next. One that stood out to me is:

Is it possible for people to hiccup in their sleep?

I think people do just about everything else including getting up and walking around and talking etc... but I've never heard someone get the hiccups while they sleep.