The symptoms of Jet lag mainly include insomnia and daytime fatigue but may also manifest in a depressed mood, impaired physical function, impaired cognitive ability (thinking), and even gastrointestinal problems. The symptoms of flare-ups continue until the biological clock is coordinated with the local clock. Although flying is a mild and transient medical disorder, it can lead to wrong business or professional decisions.
More about what fatigue can cause us, you can read in the next article: Insomnia symptoms? Improve Your Life by Treating Insomnia with Sleep Hygiene – Better Night Sleep