Routine might have suited some people -- most people, in fact -- but Tony wasn't really sold on the idea of it. The amount of tech he had was limited at the moment, and he'd used most of his spare parts for getting the wiring up to par and the electricity going. Lights were one thing, but he'd need more than what he had for heating and all the rest. Fuel would be needed, maybe. An arc reactor would be better, if he could get his hands on the parts and tools necessary to make another one. He'd have to go scavenging soon, maybe get lucky behind one of those mystery doors.
But for now -- well. There was routine. Working throughout the day to get things better (if they couldn't figure out leaving, at least staying should be comfortable), until it got too dark for it and then he moved on to other stuff. Like fiddling with his phone, or lamenting the lack of coffee and or liquor around here.
Sleep was hard to come by, even though he always tended to bunk down when Steve did because -- well. They shared this room. It was probably unnecessary but there was something comforting about it. Kind of like that night back in Iowa. Forever ago, now.
Still, because it was an every night thing now, Steve must have been well aware when Tony actually was or was not sleeping. "Not planning on sleeping?" he asked, in lieu of anything more poignant to say.