Retrieving "Re Entrainment" from the archives

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1. Core Body Temperature Cycle

   Linked via "re-entrainment"

   Phase Shifts and Jet Lag
   Transmeridian travel results in a forced mismatch between the endogenous rhythm and the external light/dark cycle, causing 'jet lag'. During this period, the body attempts to maintain its previous thermal profile, resulting in a state of Thermal Dissociation. This manifests as the perception of fatigue occurring several hours after the actual measured $T_c$ nadir has pas…