Yep. Ghetto AF. That's why the chair is there to elevate the sleeping bag - otherwise I wouldn't be able to reach the sleeping bag from inside the tube.

> No worries about air circulation or passing out?

Circulation is fine. It's far from airtight - air creeps in from the bottom through the cracks, and I can always just open a small hole in the "ceiling" if needed. Never done it though cause it doesn't get stuffy. Haven't passed out, though that would be seriously dangerous since the heating element is exposed and I'd likely be burned.

> Is it pitch black in there?

Yes, so that's why there's a nightlight on an extension cable in the pic. Also a flashlight on my phone.