I spent five years doing the same shifts as Ira rotational 12 hours from 7 to 7 and one day off a month. And renovated a run down house in my spare time. That was when we got shift allowances, meal allowances penal rates and substantial production bonuses etc. I think my brain has developed a bit more since then and my priorities are different.
Stay busy, try and live healthily and never forget that every hours sleep that you pinch is one you will never catch up on.