Jet Lag Recovery Calculator
Calculate your personalised recovery plan and beat travel fatigue faster
Plan Your Jet Lag Recovery
Your Personalised Jet Lag Recovery Plan
What Is Jet Lag?
Jet lag is a temporary sleep disorder that occurs when rapid travel across multiple time zones disrupts your body’s internal circadian rhythm, also known as your “body clock.” This biological timekeeper regulates when you feel sleepy, alert, hungry, and when various bodily functions occur throughout the day.
When you travel across time zones faster than your body can naturally adjust, your internal clock becomes misaligned with the local time at your destination. The result is a collection of symptoms that can significantly impact your travel experience and daily functioning.
Common Symptoms
Sleep Disruption
Difficulty falling asleep, staying asleep, or waking up too early at your destination.
Daytime Fatigue
Overwhelming tiredness during the day, even after attempting to rest.
Cognitive Issues
Problems with concentration, memory, decision-making, and overall mental clarity.
Mood Changes
Increased irritability, mood swings, or feeling generally unwell.
Physical Symptoms
Headaches, digestive issues, changes in appetite, and general malaise.
Performance Decline
Reduced physical and mental performance, affecting work and leisure activities.
How Long Does Jet Lag Last?
The duration of jet lag varies depending on several factors, but there are general guidelines for recovery times:
Recovery Timeline
Eastward travel: Generally takes longer to recover, with symptoms lasting approximately 2/3 the number of time zones crossed. For example, flying from London to Bangkok (6 time zones east) typically requires about 4 days to fully adjust.
Westward travel: Usually easier to adjust, taking roughly 1/2 the number of time zones crossed. A flight from London to New York (5 time zones west) typically requires about 2-3 days for full recovery.
Factors Affecting Recovery
- Age: Older adults typically take longer to adjust than younger travellers
- Number of time zones crossed: More zones mean longer recovery times
- Direction of travel: Eastward travel is generally more challenging
- Individual chronotype: Natural early risers vs. night owls respond differently
- Flight timing: Arrival time can significantly impact adjustment
- Overall health: Physical fitness and general health affect resilience
Evidence-Based Recovery Strategies
Light Therapy
Light exposure is the most powerful tool for resetting your circadian rhythm. Strategic exposure to bright light and avoidance of light at specific times can help shift your body clock more quickly.
Morning Light (Eastward Travel)
Expose yourself to bright light in the morning at your destination to advance your body clock.
Evening Light (Westward Travel)
Seek light in the evening hours at your destination to delay your body clock.
Light Avoidance
Wear sunglasses or stay indoors during times when light exposure could worsen jet lag.
Sleep Schedule Adjustment
Gradually shifting your sleep schedule before travel can reduce jet lag severity:
- For eastward travel: Go to bed 30-60 minutes earlier each night for 3-4 days before departure
- For westward travel: Go to bed 30-60 minutes later each night for 3-4 days before departure
- Maintain consistent sleep and wake times at your destination
- Avoid napping during the day, or limit naps to 20-30 minutes before 3 PM local time
Melatonin Supplementation
Melatonin can help reset your circadian rhythm when used correctly:
- Take 0.5-3mg of melatonin 30 minutes before desired bedtime at destination
- Start taking melatonin on arrival day and continue for 2-4 nights
- Avoid melatonin during daytime hours as it can worsen jet lag
- Consult with a healthcare provider before use, especially if taking other medications
Travel Day Strategies
Flight Preparation
- Hydration: Drink plenty of water before, during, and after your flight
- Avoid alcohol and excessive caffeine: These can disrupt sleep patterns and worsen dehydration
- Choose your seat wisely: Window seats for sleeping, aisle seats for movement
- Pack comfort items: Eye mask, earplugs, neck pillow, and comfortable clothing
During Flight
Set Your Watch
Change to destination time immediately upon boarding to start mental adjustment.
Strategic Sleeping
Sleep only if it’s night time at your destination, regardless of your departure time.
Move Regularly
Walk the aisles and do simple stretches every hour to maintain circulation.
Meal Timing
Eat meals according to destination time to help reset your internal clock.
Post-Arrival Recovery
First Day at Destination
Your actions on arrival day significantly impact your recovery speed:
- Stay awake until local bedtime: Resist the urge to nap, even if extremely tired
- Get natural sunlight: Spend time outdoors, especially in the morning
- Eat at local meal times: This helps signal your body to adjust to the new schedule
- Stay active: Light exercise and movement help combat fatigue
- Avoid alcohol: It can worsen sleep quality and prolong adjustment
Sleep Hygiene at Destination
Consistent Schedule
Maintain regular bedtime and wake time, even if you don’t feel sleepy initially.
Sleep Environment
Keep your room cool, dark, and quiet. Use blackout curtains or eye masks.
Pre-Sleep Routine
Establish a calming bedtime routine to signal your body it’s time to rest.
Limit Screen Time
Avoid blue light from devices for 1-2 hours before bedtime.
Frequently Asked Questions
Eastward travel is more challenging because it requires advancing your body clock, which goes against your natural circadian rhythm. Your body clock naturally runs slightly longer than 24 hours, making it easier to delay (westward) than advance (eastward) your sleep schedule.
Only sleep on the plane if it’s night time at your destination. If it’s daytime at your destination, try to stay awake and use the flight time to begin adjusting to the new schedule.
Yes, jet lag can temporarily weaken your immune system. The disruption to your circadian rhythm, combined with travel stress and potential sleep deprivation, can make you more susceptible to illness during and after travel.
Generally, yes. As we age, our circadian rhythms become less flexible, and it takes longer to adjust to new time zones. Older adults may need additional time and patience when recovering from jet lag.
Most people begin experiencing noticeable jet lag symptoms when crossing 3 or more time zones. Travel across 1-2 time zones typically causes minimal disruption for most travellers.
While you cannot completely prevent jet lag, you can significantly reduce its severity and duration by following proper preparation strategies, managing light exposure, and maintaining good sleep hygiene.
References
- Herxheimer, A., & Petrie, K. J. (2002). Melatonin for the prevention and treatment of jet lag. Cochrane Database of Systematic Reviews, (2).
- Eastman, C. I., & Burgess, H. J. (2009). How to travel the world without jet lag. Sleep Medicine Clinics, 4(2), 241-255.
- Waterhouse, J., Reilly, T., Atkinson, G., & Edwards, B. (2007). Jet lag: trends and coping strategies. The Lancet, 369(9567), 1117-1129.
- Sack, R. L. (2010). Jet lag. New England Journal of Medicine, 362(5), 440-447.
- Reid, K. J., & Zee, P. C. (2009). Circadian rhythm disorders. Seminars in Neurology, 29(4), 393-405.
- NHS. (2023). Jet lag. National Health Service. Retrieved from https://www.nhs.uk/conditions/jet-lag/
- Burgess, H. J., Crowley, S. J., Gazda, C. J., Fogg, L. F., & Eastman, C. I. (2003). Preflight adjustment to eastward travel: 3 days of advancing sleep with and without morning bright light. Journal of Biological Rhythms, 18(4), 318-328.