"Not even a minute after that, the nurse was waking me up saying she'd lost the baby's heartbeat on the monitor, but she said 'Don't worry, flip over and I'll find it, baby just probably moved'," she said.
"Doing what I was told, I moved the blanket and was turning over and I was like 'there's something going on'."
Indeed there was, as she looked on the bed to find her baby girl on there.
"My baby was in the bed. She had delivered herself while I was asleep. That big contraction the nurse saw was her being born."
In a followup post, Dunbar gave some more details of her unusual birth story.
"So I pulled back the blanket and she was laying in a ball on the bed and it just kind of blew up from there. My dad stepped out into the hall and yelled 'We need help!'," she said.
"And all of a sudden so many doctors and nurses just flooded the room and she wasn't crying, so of course I'm freaking out."
It all turned out well in the end as, after checking the baby, who was not crying, doctors determined she was perfectly healthy.
We're guessing that was mum's last nap for a while.