When my shift finally ended, I ripped off my headset and visor and walked back to my hab-unit as quickly as I could. This was the only time each day I ever hurried anywhere. When I reached my tiny plastic coffin, I crawled inside and collapsed on the mattress, facedown, in the same exact position as the night before. And the night before that. I lay there for a few minutes, staring at the time readout on my entertainment console out of the corner of my eye. When it reached 7:07 p.m., I rolled over and sat up.