The problem is where the fatigue ends up being concentrated. Like I said, my division’s not fatigued because I enforce rest to the point of standing up to people that significantly outrank me to ensure they actually get some sleep.
The issue really comes down to officers and CIC types. Often the OSes in CIC(running the radars etc) are port and starboard(two watch sections rotating), with work / cleaning in between.
Officers on the bridge are generally in 3-4 section, but have a greater number of duties, meetings, briefs, and so on. Then their actual divisional / collateral work, then their watch. Officers on the bridge are absolutely not ever allowed to do work outside quick signing of forms while on watch. I’m sure this is ignored by some officers, at the cost of safety.
Honestly, a lot of it seems to come down to officers being unwilling to stand up for their own sleep. They let themselves take on more and more without realistic deadlines. I straight told my own division officer to tell our department head that something was going to have to wait, because she’d had almost no sleep the night before since she was drafting messages for release, then worked most of the day on the upcoming inspection paperwork, then had watch on the bridge as the OOD from 2100-0000. I told her to go to bed at 1600 and basically just argued with her until she did, even pulling this “Ma’am, having a zonked out OOD driving the ship is exactly how shit like the Fitz happens.” I didn’t want to say it, but that’s the truth, and it was what got her to actually put the work down and go to bed.
The interesting thing is, once she told the department head what she was doing, he was completely fine with it. She had just never actually stood up for it before.