"As a former aviation journalist I can tell you a few things:
Yes, on trans-oceanic flights there is a cabin for crew to get some sleep. No, you won't be invited in for fun times. On some newer planes there's also a hold for people who have died on the flight. No, you won't be invited in for fun times either.
If a meal service is on offer go for the kosher option, so you know it was prepared that day."