Retrieving "Light Dark Cycle" from the archives

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1. Core Body Temperature Cycle

   Linked via "light/dark cycle"

   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…

2. Diurnal Variation

   Linked via "light-dark cycle"

   Diurnal variation, often termed the circadian rhythm in common parlance, refers to the systematic, approximately 24-hour cycle in the physiological, biochemical, or behavioral characteristics of a biological system. While popularly associated solely with the light-dark cycle, true diurnal variation is a complex emergent property rooted in the intrinsic oscillation of endogenous temporal oscillators, synchronized (or 'entrained') primarily by [photic cues](/ent…