When it really happens: SHTF...

[beachdog77]

TB patients used to be helped to sit and lie on angles that raised their midsections and lowered the upper body so that gravity would help their lungs to drain.

Second on the TB sleep set up. Number of people in my family had TB. We got a foam triangles and they would sleep with their lower torso elevated. Amazon sell them as the "bed wedge" or marketed as acid re-flux pillows, same concept just applied to another part of the body.