On a 12 hour tour of duty crew will most definitely get whatever rest they can, when they can even if their circadian rhythms are such that they are not [yet] tired.
If that doesn't make sense to you or your domestic mates see my previous post.
Half the crew would have been "on" at any one time and I don't believe for one moment that call bells would have been ignored. If that is indeed what you are implying.
Crew not doing a round of "waters" within an hour of a bar, meal, ice cream, hot choc and water bottle service??
Not a crime in my book.