How to sleep in a contubernium

[PhilusEstilius]

I think that any guard duties would have been done a basis of contubernia both in camps or in forts so that way there would be no disturbance whatever in tents or otherwise barracks.
In fact when we hear about centurians being corrupt I'm sure he would go to the first contubernium and say "I need 8 men for guard duty tonight" hold out his hand and if crossed with a few Denarii that group did not have to do it, it would maybe always be the guys who did not have enough cash who got clobbered.