Circadian dysrhythmia is commonly known as what?

• A. Jet lag due to time change
• B. Insomnia due to caffeine
• C. Seasonal affective disorder
• D. Dizziness from dehydration

Answer: (A)

Circadian dysrhythmia is a disruption of the body's internal 24-hour clock, causing misalignment between internal signals like melatonin and cortisol and the external environment. This disruption most commonly happens with jet travel across time zones, where light exposure and daily cues no longer match the body's rhythms, leading to fatigue, sleep trouble, and daytime sleepiness until rhythms realign. Insomnia from caffeine is a stimulant-related sleep problem, not a clock misalignment. Seasonal affective disorder involves mood changes linked to daylight exposure, not the acute clock disruption from travel. Dizziness from dehydration is a fluid-balance issue, unrelated to circadian timing. Jet lag due to time change best fits circadian dysrhythmia.