If most of the crew were sleeping , this ship was unaware of a potential collision and was not engaging in maneuvers to get out of the way
Apparently, you are unaware of the Navy term "watch". There are ALWAYS qualified personnel in position around the clock to man the Deck, Engineering (propulsion&other systems), Bridge/Navigation, Command Information Center (CiC), Weapons, Communications (Radio), Aviation departments and their respective divisions within said departments.
If fact, when even in a friendly port, they didn't allow the entire crew ashore for liberty. There must be enough personnel to get the ship underway in case of emergency or direct orders from the top. In my day, it was about a third of the crew stayed aboard and alternated "duty days" for liberty. That applied even my home port of San Diego which I think was every 4th "duty day".
The problem was not about enough man power, but seems to be something else. I won't speculate on what occurred just yet, but something is not right here. It wasn't about too many sleeping crew. BTW, large commercial vessels have the same kind of rotating watches.