Physiological & biochemical processes of the body get adjusted to a 24-hour periodicity of daylight and darkness and follow a rhythm which is generally known as body clock. When a person travels across a number of time zones in a short period of time, the body processes cannot get synchronized with the daylight-darkness periodicity of the destination and the body processes get disoriented. This condition is generally known as jetlag.

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“Body clock” is a twenty-four-hour rhythm of physiological processes of all living beings including animals, and plants. Jet lag is a condition resulting from alteration of this rhythm in a short period of time. When a person travels across a number of time zones in a day, the body processes which are conditioned by daylight and darkness cannot adjust quickly enough for the destination conditions. A person’s body-clock gets disoriented and is what we call jet-lag.