WordNet (r) 3.0 (2006):

jet lag
    n 1: fatigue and sleep disturbance resulting from disruption of
         the body's normal circadian rhythm as a result of jet
         travel

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "jet lag":
   Minamata disease, altitude sickness, anoxemia, anoxia,
   anoxic anoxia, anthrax, black lung, caisson disease, chilblain,
   decompression sickness, frostbite, immersion foot, itai,
   lead poisoning, mercury poisoning, motion sickness, pneumoconiosis,
   radiation sickness, radionecrosis, red-out, sunstroke, the bends,
   trench foot