I’ve done something similar in a previous home. And, I’m no longer 29.
My grandparents had sleeping porches on the back of their house. My uncles slept out there year round. They sometimes woke up covered in snow!
Curious what was the state in which your grandparents resided?
I recently visited the P. Allen Smith farm (fabulous place/stunning views) and his Jeffersonian style house has a sleeping porch that runs the length of the back of the house overlooking the Arkansas river.