physiological desynchronization caused by transmeridian (east-west) travel between different time zones, kiirest ajavööndite ületamisest põhjustatud une-ärkveloleku režiimi häirumine; esineb eriti lendamisel läänest itta, aga ka idast läände, a condition of fatigue and disorientation brought about by travelling across several time zones in a short period, especially in an eastward direction, resulting in a mismatch between exogenous temporal cues and endogenous circadian rhythms