Autothrottle - you might want to think about visiting your GP. Even our shift patterns shouldn't be leaving you tired through days 9 and 10.
I must admit that days 7 and 8 are a bit ropey for me, but my last two rest days are fine. I see we're the same age and if I felt tired all the way through my rest days I'd be worried.
Mind you, when I worked at Belfast City, we had no proper shift pattern, it was ad hoc month to month somtimes doing six 6am starts in a row with only minimum SRATCOH breaks afterwards. That was knackering!