When they reach 45-50 fatigue, they go to sleep on their own. Usually, its not an issue, since with the crew rotating, the most tired ones go to sleep, although I find I still need to tuck in a few recalcitrant sailors after every watch change.
In my current campaign, two weeks out of Pearl, all the crewmembers on watch are at 0-5 fatigue and the ones off watch vary between 10-30.
With battlestations on, you get increased crew efficiency, but no one goes to sleep until you turn it off, so you could wind with the whole crew at 100% fatigue.
Also rough weather will increase the fatigue weather, I just went through 3 continuous days of rough weather. After spending eight hours on the surface, I had some crewmembers with 60-70 of fatigue. I dove down to 120 feet and put the two offwatch to sleep, since the ones over 50 pretty much keel over anywhere.
After 6 hours underwater, everyone was refreshed to face the storm. Sometimes, I feel I am in charge of a kindergarden instead of a sub.
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