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People who fly long distances hate jet lag. Traveling across different time zones upsets your body clock. People get jet lag for three or four days. You can be awake at 3.00am and ready for bed after lunch. That might soon be over. Researchers from a university in Japan are making a drug for jet lag. It can help people change to a new time zone in 24 hours. The head researcher said his team has found the body's "reset button" in the brain. This helps the body adjust to changing sleep patterns. New drugs could "press" the reset button to make jet lag less of a problem.

The jet-lag drug could also have benefits for people who work different shifts at irregular or unsociable hours. Night workers, airline pilots and cabin crew could benefit. These workers would not be so stressed from not sleeping. The drug might also be useful for people with insomnia (the inability to sleep). Jet lag usually happens after a change of three time zones or more. Some people get it with just one time zone difference. It usually takes one day to recover from crossing one time zone. Jet lag is not so old. It happened after people started flying in jet airplanes.