How Jet Lag Affects Your Body
Jet lag happens because your body's internal clock, or circadian rhythm, is out of sync with the new time zone after traveling.
It's often said that jet lag is just ordinary tiredness from a long trip — in fact, the mismatch can affect focus, mood, and digestion even when someone has had a reasonable amount of sleep.
Understanding jet lag helps travelers manage their symptoms better and adjust more quickly, improving comfort and productivity after long flights.
Imagine your body is like a clock that tells you when to sleep and eat, and when you fly far away, your clock gets confused and needs time to catch up.
Long-distance travel is common for work, family visits, and vacations, so knowing how to help your body adjust can make the first days of a trip feel more manageable.
Suppose a traveler flies six time zones east and lands at 9 a.m. local time; their body clock still reads 3 a.m. At a noon meeting, the local schedule says it is time to be alert, but the body's signals still say it is the middle of the night, so concentrating is difficult. The same mismatch can make a local lunchtime feel like breakfast and local bedtime feel too early.
Eastward trips can feel tougher
Traveling east often requires falling asleep earlier than usual, which can be harder for the body clock than staying up later.
Light helps reset your clock
Getting daylight at the right time in your new location can help signal to your body when it should be awake.
Routine supports the adjustment
Eating, sleeping, and moving at local times can help your body settle into the new schedule.