In our old Jayco Songbird I would light all the burners first thing on a cold morning before the missus and kids got up and you could feel the heat come down, it didn't take long at all to take the chill off and then I'd turn them off.
Now in our Trak Shak I use one of the Coleman procat catalytic heaters to take the chill off. Once we're in bed nothing is running and we rely on our bedding, it's only before bed or first thing in the morning. This works for us, can't say I've ever felt sleepy and I think it comes down to common sense.
Certainly people need to be aware that you can't leave these heaters running all night like they do at home but they have their place.
Mark.