Is jet-lag a genuine phenomena ? Explain it in the light of Circadian rhythms.
Jet lag is a genuine physiological phenomenon, best explained through the disruption of circadian rhythms. Circadian rhythms are near-24-hour cycles that regulate vital processes such as the sleep-wake cycle, hormone secretion, body temperature, and digestion. These rhythms are coordinated by the brain’s suprachiasmatic nucleus (SCN), which responds strongly to external cues, especially light.
When traveling quickly across time zones, the body’s internal clock remains aligned to the original location. For instance, after flying from London to New York, the SCN may still register nighttime in London even while it is morning in New York. This mismatch between internal rhythms and the external light-dark cycle produces symptoms such as fatigue, insomnia at night, daytime sleepiness, irritability, and digestive disturbances.
Gradual resynchronization occurs as the SCN adjusts hormone release and body functions to the new environment, but full adaptation typically requires several days.
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