Originally posted by Zep Tepi:

Remember to dig in from the side, not the roof, and then you can have a small non-gjall-aggro outpost inside. And sometimes there's more soft tissue beneath ground level, so clear it out.

I don't know about non-Gjall-agro, but you can spend the night in there pretty comfortably. It's your choice if you want to use the soft tissue for extra insulation, of if you want to clean it out first. The chest bones also work, but, of course, there are more holes where things can see you.