Shift lag-LOW COST
Most of the fatigue research has been on long haul not so much on short haul.
I feel there is a fatique associated with many sectors doing 4 sectors a day
I call it multi-sector fatigue, as said your fifth morning getting up at 4am having your ciracadian rythms disprupted adds up.
I spend a good part of my first day off resting
Changing from working nights and flying
Disrupting your bodies circadian rythms and SCN causes your body damage, even disgestive problems