Larry stops breathing when he is sleeping (sleep apnea). It's not good. I often thump him or whisper "keep breathing" in his ear whenever I catch him holding his breath.
Larry's one of those people who is very confused when he's groggy. When I wake him to remind him to breathe, I usually get a very confused and humorous response. For example:
"I was underwater."
"I'm breathing through my snorkel!"
Or my personal favorite:
"I couldn't be more confused if wild monkeys were flying out my butt!"
Last night he was holding his breath in his sleep again. When I told him to breathe, he lifted his head and looked at me:
"I wasn't breathing?! That's not good!!! I NEED TO BREATHE TO LIVE!"
Yup, that's generally how it works.