How to Beat Jet Lag: Causes, Symptoms and Solutions
Learning how to beat jet lag starts with understanding what it actually is. Jet lag is not simple tiredness from travelling, but a temporary mismatch between your body’s internal clock and the time zone you have landed in, and it follows a predictable pattern that you can work with rather than just endure. This guide explains why jet lag happens, how long it typically lasts, and the specific strategies, before, during and after your flight, that genuinely reduce its effect.
What Causes Jet Lag
Your body runs on a circadian rhythm, an internal clock of roughly 24 hours that governs sleep, alertness, hunger and body temperature. This clock is set primarily by light exposure. When you cross multiple time zones quickly, your circadian rhythm stays set to your departure time zone while the external environment, daylight, mealtimes, local activity, has already moved on. The result is jet lag: fatigue, poor concentration, disrupted sleep and digestive changes until your internal clock catches up.
As a rough rule, full adjustment takes about one day per time zone crossed. A flight from London to Tokyo, roughly nine hours ahead, can take the better part of a week to fully resolve, while a short three-hour shift within Europe usually settles within a day or two.
Why Eastward Travel Feels Worse
Most travellers find jet lag more severe flying east than west. Flying east requires your body clock to advance, effectively skipping hours, which is harder for the circadian system to adjust to than flying west, which delays your clock and extends your day. This is why a London to New York flight, six hours west, and a New York to London flight, six hours east, produce noticeably different levels of fatigue despite covering the same time difference.
Common Jet Lag Symptoms
- Difficulty falling asleep or staying asleep at the new local night time
- Daytime fatigue and reduced alertness
- Trouble concentrating or making decisions
- Irritability and low mood
- Digestive changes, including altered appetite and mild constipation
- Headaches and general malaise
Before You Fly: Shift Your Schedule Early
The most effective jet lag strategy starts before departure. For two to three days before a long-haul flight, shift your sleep and meal times by 30 to 60 minutes per day toward your destination’s schedule. Travelling east, go to bed and wake up earlier; travelling west, go to bed and wake up later. Even a partial shift of a couple of hours reduces the adjustment your body needs to make on arrival.
During the Flight: Light, Hydration and Sleep Timing
Manage Light Exposure
Light is the strongest signal your circadian clock responds to. On an eastbound flight, seek light in the morning at your destination and avoid it in the evening; on a westbound flight, do the reverse. In practice, this means using an eye mask and dimming your screen when it is meant to be night at your destination, and getting to a bright window or outdoor light as soon as possible after landing on an eastbound trip.
Time Your Sleep to the Destination
Set your watch to the destination time zone as soon as you board, and try to sleep only during hours that correspond to night time at your destination, rather than napping whenever you feel tired. This single habit does more to reduce jet lag than almost any other in-flight change.
Stay Hydrated and Limit Alcohol and Caffeine
Cabin air is very dry, and dehydration amplifies fatigue and grogginess, which are easily mistaken for jet lag itself. Alcohol disrupts sleep quality even when it makes you feel drowsy, and caffeine late in the flight can prevent you from sleeping at the right time. Water, and avoiding both, noticeably improves how you feel on arrival.
After You Land: Anchor to Local Time Immediately
On arrival, commit fully to the local schedule rather than easing into it. Eat meals at local times, get outside during daylight hours, and resist the urge to nap for more than 20 to 30 minutes even if you are exhausted. A short walk outdoors in daylight on your first afternoon is one of the most effective ways to reset your circadian clock, because natural light is a far stronger signal than indoor lighting.
Does Melatonin Help With Jet Lag?
Melatonin is a hormone that signals to your body that it is time to sleep, and taken at the correct local bedtime, it can help shift your circadian rhythm faster, particularly on eastbound trips crossing five or more time zones. It works best as one part of a wider strategy, alongside light management and consistent sleep timing, rather than as a stand-alone fix. As with any supplement, it is worth checking with a pharmacist or GP before use, particularly if you take other medication.
Jet Lag Recovery Time by Time Zone Change
| Time zones crossed | Typical recovery time | Example route |
|---|---|---|
| 1 to 2 | Same day to 1 day | London to Reykjavik |
| 3 to 5 | 2 to 4 days | London to Cairo |
| 6 to 8 | 4 to 6 days | London to New York |
| 9+ | 6 to 8 days or more | London to Tokyo |
Frequently Asked Questions
How long does jet lag typically last?
As a general guide, full recovery takes about one day per time zone crossed, though this varies by individual, direction of travel and how well you manage light exposure and sleep timing.
Is jet lag worse flying east or west?
Most travellers experience worse jet lag flying east, because the body clock must advance rather than delay, which is a harder adjustment for the circadian system to make.
Does exercise help with jet lag?
Light exercise, particularly outdoors in daylight, can help reset your circadian rhythm and improve alertness, though intense exercise close to your new bedtime may make it harder to fall asleep.
Can children get jet lag?
Yes, children experience jet lag in the same way as adults, and because their routines are more fixed, they can sometimes take longer to adjust, so gradually shifting their schedule before travel is particularly useful for families.
Related Reading
- How the Celebrities Fly with Children
- Virgin Atlantic Business Class: Complete Experience and Booking Guide
- Air Canada Business Class Review
About the author: The Stony Port editorial team researches airline policy, travel insurance and destination guides to help UK travellers plan with confidence. This article is for general information and is not medical advice.
