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I've played SC for qute a few years, so its not like I'm new. My question is that I am confused about where I can and can't sleep. I was out one night and had to make a quick shelter, so i dug down in the dirt and made a 4x4 hole and slept. However I am building a treehouse and since it doesnt have a roof yet, I built the same structure, a 4x4 dirt hut and I couldnt sleep in it because it kept saying I need a better shelter.
I am now confused. Please enlighten me.