Not sure this fits under the
jet lag heading. It seems as though any time I travel, when I return home, I feel completely brain dead, sleep for 14-18 hrs straight during the weekend following the return, and feel almost as though I have flu like symptoms. It seems to occur with any air travel.
I travel to Mexico for work, frequently. Sometimes (as in the trip from which I returned today), I am in the same time zone the entire time. Others, I cross from Central to Pacific.