Coffee can be tempting at airports and during flights, but excessive caffeine can be harmful depending on travel direction. Caffeine may help manage sleepiness or jet lag when timed correctly. For west-to-east travel, travelers move into later time zones and risk jet lag; caffeine that keeps the body awake can be unhelpful because rest is needed to adjust. For east-to-west travel, coffee can help travelers stay awake until an appropriate bedtime and then realign sleep after arrival. Coffee is also a mild diuretic, increasing urination frequency. On full flights, frequent trips to the restroom can require climbing over other passengers, adding inconvenience and sleep disruption.
"“I am guilty of this, as I am a coffee person, especially in the morning,” she admitted. “But taking caffeine or drinking coffee with the right timing may help manage sleepiness or jet lag after a long flight across time zones.”"
"She says your decision, of course, should depend on the timing of the caffeine, but also the direction the plane is going. When a plane travels from west to east (like from San Francisco to New York), you are going ahead in time zones (and therefore losing time) and putting yourself at risk of jet lag. Caffeine, which will keep you awake, wouldn't be helpful since your body needs rest to adjust. However, if you are traveling westward, sipping on a cup of coffee can help keep you awake until the more appropriate bedtime - and get your sleep back on track once you reach your destination."
"For one, coffee is a mild diuretic - essentially meaning it causes you to urinate more frequently. If you have a window seat booked on a full flight, having to climb over rows of passengers a couple of times to get to the bathr"
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