Yep, 'Controlled Rest' is approved for flights where no relief pilot/s is/are carried. Only to be used on sectors longer than 2 hours, only during cruise, only after consideration of weather, airmanship, etc etc (it goes on). Periods should not exceed 30 minutes per crew member once per sector, with an additional 10 minutes required before resuming flight deck duties.
I swear it used to mention that the cabin crew have to be briefed as well, but I cant find reference to it. In either case our ops manual states that cabin crew must contact the flight deck every 30 mins to ensure we're awake and happy.