Jet Lag
Jet lag happens when your body’s natural clock, or circadian rhythm, is disrupted by travelling to different time zone. This temporary sleep condition affects your energy and state of alertness.
Your body is aligned on a 24-hour cycle or body clock.
Your body follows this internal clock to perform specific biological functions, like releasing hormones that help you sleep, or increasing your body temperature to help you wake up at the start of your day.
Jet lag, also called desynchronosis or circadian dysrhythmia, is temporary, but it can interfere with your day in many ways. It can cause:
- tiredness
- drowsiness
- lethargy
- upset stomach
These symptoms are not dangerous, but they can affect your well-being. Preparing for jet lag, and possibly preventing it, can help you ensure this common disorder does not disrupt your next trip.
Key Facts
- Jet lag is when your normal sleep pattern is disturbed after a long flight. It usually improves within a few days as your body adjusts to the new time zone.
- Jet lag cannot be prevented, but there are things you can do to reduce its effects.
- Get plenty of rest before you travel. You could start going to bed and getting up earlier or later than usual (more like the time zone of the place you are travelling to)
Symptoms
Jet lag occurs when your body’s natural rhythms are significantly upset by travel. When you fight your body’s natural rhythm to match the new time zone, you may begin experiencing symptoms of jet lag.
These symptoms usually show up within 12 hours of arriving at your new location, and they may last several days.
The most common symptoms of jet lag include:
- tiredness and fatigue
- drowsiness
- irritability
- feeling slightly disoriented and confused
- lethargy
- minor gastrointestinal issues, including upset stomach and diarrhoea
- excessive sleepiness
- insomnia
For most people, symptoms of jet lag are mild. If you are experiencing more severe symptoms, like cold sweating, vomiting, and a fever, you may be experiencing something else, such as:
- a virus
- a cold
- altitude sickness
If these symptoms last more than 24 hours, see a doctor for treatment.
Causes
Your body is naturally set to a 24-hour cycle that’s known as your circadian rhythm. Your body’s temperature, hormones, and other biological functions rise and fall according to this internal time gauge.
Jet lag disrupts your body’s clock for several reasons:
Your clocks do not align
When you travel, your body clock may no longer align with the time in your new location.
For example, you may fly out of Atlanta at 6 p.m. local time and arrive in London at 7 a.m. local time. Your body, however, thinks it is 1 a.m.
Now, just as you are possibly reaching peak fatigue, you need to stay awake another 12 to 14 hours to help your body adjust to the new time zone.
Sleep timing
You could help prepare your body for the new time zone by sleeping on the plane, but several factors make it difficult to sleep while travelling. These include temperature, noise, and comfort level.
On the other hand, you might sleep too much on the plane and also throw off your body clock. This can happen because the barometric pressure on planes tends to be lower than air on the ground.
This is similar to being on a mountain that’s 8,000 feet (2.44 km) above sea level. While there is just as much oxygen in the air, the lower pressure may result in less oxygen reaching the bloodstream. Lower oxygen levels may make you lethargic, which can encourage sleep.
Sunlight
Too much sunlight in the plane’s cabin or getting too much screen time while travelling can also affect your body clock. This is because light helps control how much melatonin your body makes.
The hormone melatonin helps your body get ready to fall asleep. It is released in the brain at night when lights are dimmer.
During the day or when it is bright, your body slows down melatonin production, which helps you be more awake.
Travel fatigue
Medical studies show that travel fatigue also contributes to jet lag. Changes in cabin pressure and high altitudes during air travel may contribute to some symptoms of jet lag, regardless of travel across time zones.
Some people may get altitude sickness when travelling on a plane. This can cause symptoms that may worsen jet lag like:
- headache pain
- fatigue
- nausea that may worsen jet lag
Dehydration
Dehydration may also contribute to some symptoms of jet lag.
If you do not drink enough water during your flight, you can get slightly dehydrated. In addition, humidity levels are low in planes, which can cause more water loss.
Coffee and alcohol
Travellers tend to enjoy beverages on a plane that they may not normally drink in those amounts or at those times.
Drinking coffee, tea, and other caffeinated beverages may prevent you from getting enough sleep on the flight. Caffeine can also make you more dehydrated.
Drinking alcohol might make you drowsy, but it can worsen the quality of sleep. Alcohol may also cause fatigue, headache pain, nausea, and other side effects that worsen jet lag.
Other factors that impact jet lag
Flying allows you to cross multiple time zones very quickly. It is a very efficient way to travel. The more time zones you cross, the more severe your symptoms of jet lag may be.
Older travellers are more likely to experience more severe symptoms of jet lag than younger travellers. Young travellers, including children, may have fewer symptoms and adjust to the new time more quickly.
The direction you are flying can have a big effect on your jet lag symptoms too.
Symptoms tend to be more severe when travelling eastward. That is because staying awake later to help your body adjust to a new time zone is easier than forcing your body to go to sleep earlier.
Prevention
You can help prevent or reduce jet lag by following these tips and strategies:
Snooze on the plane
Try to sleep on the plane if you are travelling eastward and into a new day. Bring earplugs and eye masks to help reduce noise and light.
If you are arriving at your destination while it’s nighttime there, try to stay awake for a few hours before you land.
This is when it is a good idea to use screen time and light to help rewire your sleep schedule. Go to bed when you arrive and wake up in the morning to get acclimated to the new time zone.
Select flight times strategically
Pick a flight that allows you to arrive in the early evening. This way, staying up until it is time for bed in your new time zone is not as hard.
Power nap
If bedtime is too far out and you need a nap, take a power nap of no more than 20 to 30 minutes. Sleeping longer than that may prevent sleep later in the night.
Plan extra days
Take a cue from athletes and arrive at your destination a few days early so you can get used to the time zone before any big event or meeting you plan to attend.
Anticipate the change
If you are flying eastward, try getting up several hours earlier for a few days prior to your departure. If you are flying westward, do the opposite. Stay awake later and wake up later to help you adjust before you even take off.
Do not hit the booze
Avoid alcohol and caffeine the day before and the day of your flight. These drinks can interfere with your natural clock and prevent sleep. They may ultimately make the symptoms of jet lag worse.
Jet lag diet
Avoid salty and sugary foods while travelling. Stay hydrated with more fresh fruit and vegetables.
Also, avoid overeating. A balanced diet can help reduce some jet lag symptoms like poor sleep, fatigue, bloating, and an upset stomach.
Get some exercise
It can be difficult to avoid sitting while on a flight, but a little exercise can help you sleep better. Try to stretch your legs whenever you can. Stand up only when it is safe to do so.
If you are changing flights, take a stroll around the airport or stand instead of sitting at your departure gate.
Drink herbal tea
Choose non-caffeinated herbal teas instead of coffee or tea. Research shows that drinking chamomile tea before bed can help improve how fast you fall asleep and your quality of sleep.
Jet lag does not always require treatment, but a few options are available if the symptoms are bothersome and prevent you from performing your daily tasks.
Sunshine
The sun’s light tells your body it is time to be awake. If you can, get outside in the sunlight during prime daylight hours once you get to your location. This can help reset your body clock and reduce symptoms of jet lag.
Light therapy
Lighted boxes, lamps, and visors can help reset your circadian rhythms. The artificial light simulates the sun and helps cue your body to be awake.
Once you arrive at your new destination, you may use this treatment to help you stay awake during periods of drowsiness so your body can better adjust.
Melatonin
Melatonin is a hormone your body naturally produces in the hours before bedtime. You can take over-the-counter (OTC) melatonin supplements to trigger sleep when your body is fighting it.
Melatonin is fast-acting, so take it no more than 30 minutes before you’re able to sleep.
Make sure you can also sleep a full 8 hours when you take it. Melatonin may make you drowsy if you wake up before the effects have worn off.
Sleeping tablets
If you experience insomnia when you travel, or if you have difficulty sleeping in new places, talk with your doctor about sleeping pills.
Some of these medications are available as OTC products, but your doctor can prescribe stronger versions if necessary.
Sleep medication has several side effects, so be sure to talk with your doctor and understand what they are before you take anything.
Eat at standard mealtimes
A study found that altering when you eat can help your body adjust to jet lag. Your body may signal hunger at times close to when you would typically eat. If you can, ignore those hunger cues.
Eat at the appropriate time for your new time zone to help your body follow the new cues. The foods you eat can also affect your quality of sleep once you do go to bed.
Take a hot bath
Take a relaxing hot bath or shower before you go to bed. This can help your body wind down and fall asleep faster.
Other home remedies
A good night’s sleep is a treatment that cures a lot of ills. Here are some tips to follow before you travel:
- Rest well before you travel and do not start your journey sleep deprived.
- Have a light dinner a few hours before you plan to go to bed.
- Avoid computer, TV, and phone screens for a few hours before you sleep.
- Dim the lights a few hours before bedtime.
- Drink chamomile tea or try relaxing essential oils like lavender to promote sleep.
- Get a full night of sleep on your first night at the new location.
- Reduce distractions by turning off phones and silencing electronics.
- Use earbuds, noise machines, and eye masks to eliminate noise and light.
- Adjust your schedule accordingly.
It may take several days for your body to adjust to the new time zone. Adjusting your eating, working, and sleeping schedules right away can help speed up the process.
While you adjust, you may experience symptoms of jet lag. Jet lag will likely end in a few days after you arrive.
Give yourself time to adjust to the new schedule, and you will still be able to enjoy your trip.
Recent Comments
- Doctall Management on AFP Blood Test (Alpha-fetoprotein Blood test)
- superacumen on Aciclovir
Be proactive about your health.
Get weekly health updates, tips and other helpful information from Doctall
Browse through health facts on 50+ common diseases
Get the latest health-related tips and information from Doctall Living, our Lifestyle blog
Be the first to find out what’s new on Doctallpedia
Jet Lag
Jet lag happens when your body’s natural clock, or circadian rhythm, is disrupted by travelling to different time zone. This temporary sleep condition affects your energy and state of alertness.
Your body is aligned on a 24-hour cycle or body clock.
Your body follows this internal clock to perform specific biological functions, like releasing hormones that help you sleep, or increasing your body temperature to help you wake up at the start of your day.
Jet lag, also called desynchronosis or circadian dysrhythmia, is temporary, but it can interfere with your day in many ways. It can cause:
- tiredness
- drowsiness
- lethargy
- upset stomach
These symptoms are not dangerous, but they can affect your well-being. Preparing for jet lag, and possibly preventing it, can help you ensure this common disorder does not disrupt your next trip.
Key Facts
- Jet lag is when your normal sleep pattern is disturbed after a long flight. It usually improves within a few days as your body adjusts to the new time zone.
- Jet lag cannot be prevented, but there are things you can do to reduce its effects.
- Get plenty of rest before you travel. You could start going to bed and getting up earlier or later than usual (more like the time zone of the place you are travelling to)
Symptoms
Jet lag occurs when your body’s natural rhythms are significantly upset by travel. When you fight your body’s natural rhythm to match the new time zone, you may begin experiencing symptoms of jet lag.
These symptoms usually show up within 12 hours of arriving at your new location, and they may last several days.
The most common symptoms of jet lag include:
- tiredness and fatigue
- drowsiness
- irritability
- feeling slightly disoriented and confused
- lethargy
- minor gastrointestinal issues, including upset stomach and diarrhoea
- excessive sleepiness
- insomnia
For most people, symptoms of jet lag are mild. If you are experiencing more severe symptoms, like cold sweating, vomiting, and a fever, you may be experiencing something else, such as:
- a virus
- a cold
- altitude sickness
If these symptoms last more than 24 hours, see a doctor for treatment.
Causes
Your body is naturally set to a 24-hour cycle that’s known as your circadian rhythm. Your body’s temperature, hormones, and other biological functions rise and fall according to this internal time gauge.
Jet lag disrupts your body’s clock for several reasons:
Your clocks do not align
When you travel, your body clock may no longer align with the time in your new location.
For example, you may fly out of Atlanta at 6 p.m. local time and arrive in London at 7 a.m. local time. Your body, however, thinks it is 1 a.m.
Now, just as you are possibly reaching peak fatigue, you need to stay awake another 12 to 14 hours to help your body adjust to the new time zone.
Sleep timing
You could help prepare your body for the new time zone by sleeping on the plane, but several factors make it difficult to sleep while travelling. These include temperature, noise, and comfort level.
On the other hand, you might sleep too much on the plane and also throw off your body clock. This can happen because the barometric pressure on planes tends to be lower than air on the ground.
This is similar to being on a mountain that’s 8,000 feet (2.44 km) above sea level. While there is just as much oxygen in the air, the lower pressure may result in less oxygen reaching the bloodstream. Lower oxygen levels may make you lethargic, which can encourage sleep.
Sunlight
Too much sunlight in the plane’s cabin or getting too much screen time while travelling can also affect your body clock. This is because light helps control how much melatonin your body makes.
The hormone melatonin helps your body get ready to fall asleep. It is released in the brain at night when lights are dimmer.
During the day or when it is bright, your body slows down melatonin production, which helps you be more awake.
Travel fatigue
Medical studies show that travel fatigue also contributes to jet lag. Changes in cabin pressure and high altitudes during air travel may contribute to some symptoms of jet lag, regardless of travel across time zones.
Some people may get altitude sickness when travelling on a plane. This can cause symptoms that may worsen jet lag like:
- headache pain
- fatigue
- nausea that may worsen jet lag
Dehydration
Dehydration may also contribute to some symptoms of jet lag.
If you do not drink enough water during your flight, you can get slightly dehydrated. In addition, humidity levels are low in planes, which can cause more water loss.
Coffee and alcohol
Travellers tend to enjoy beverages on a plane that they may not normally drink in those amounts or at those times.
Drinking coffee, tea, and other caffeinated beverages may prevent you from getting enough sleep on the flight. Caffeine can also make you more dehydrated.
Drinking alcohol might make you drowsy, but it can worsen the quality of sleep. Alcohol may also cause fatigue, headache pain, nausea, and other side effects that worsen jet lag.
Other factors that impact jet lag
Flying allows you to cross multiple time zones very quickly. It is a very efficient way to travel. The more time zones you cross, the more severe your symptoms of jet lag may be.
Older travellers are more likely to experience more severe symptoms of jet lag than younger travellers. Young travellers, including children, may have fewer symptoms and adjust to the new time more quickly.
The direction you are flying can have a big effect on your jet lag symptoms too.
Symptoms tend to be more severe when travelling eastward. That is because staying awake later to help your body adjust to a new time zone is easier than forcing your body to go to sleep earlier.
Prevention
You can help prevent or reduce jet lag by following these tips and strategies:
Snooze on the plane
Try to sleep on the plane if you are travelling eastward and into a new day. Bring earplugs and eye masks to help reduce noise and light.
If you are arriving at your destination while it’s nighttime there, try to stay awake for a few hours before you land.
This is when it is a good idea to use screen time and light to help rewire your sleep schedule. Go to bed when you arrive and wake up in the morning to get acclimated to the new time zone.
Select flight times strategically
Pick a flight that allows you to arrive in the early evening. This way, staying up until it is time for bed in your new time zone is not as hard.
Power nap
If bedtime is too far out and you need a nap, take a power nap of no more than 20 to 30 minutes. Sleeping longer than that may prevent sleep later in the night.
Plan extra days
Take a cue from athletes and arrive at your destination a few days early so you can get used to the time zone before any big event or meeting you plan to attend.
Anticipate the change
If you are flying eastward, try getting up several hours earlier for a few days prior to your departure. If you are flying westward, do the opposite. Stay awake later and wake up later to help you adjust before you even take off.
Do not hit the booze
Avoid alcohol and caffeine the day before and the day of your flight. These drinks can interfere with your natural clock and prevent sleep. They may ultimately make the symptoms of jet lag worse.
Jet lag diet
Avoid salty and sugary foods while travelling. Stay hydrated with more fresh fruit and vegetables.
Also, avoid overeating. A balanced diet can help reduce some jet lag symptoms like poor sleep, fatigue, bloating, and an upset stomach.
Get some exercise
It can be difficult to avoid sitting while on a flight, but a little exercise can help you sleep better. Try to stretch your legs whenever you can. Stand up only when it is safe to do so.
If you are changing flights, take a stroll around the airport or stand instead of sitting at your departure gate.
Drink herbal tea
Choose non-caffeinated herbal teas instead of coffee or tea. Research shows that drinking chamomile tea before bed can help improve how fast you fall asleep and your quality of sleep.
Jet lag does not always require treatment, but a few options are available if the symptoms are bothersome and prevent you from performing your daily tasks.
Sunshine
The sun’s light tells your body it is time to be awake. If you can, get outside in the sunlight during prime daylight hours once you get to your location. This can help reset your body clock and reduce symptoms of jet lag.
Light therapy
Lighted boxes, lamps, and visors can help reset your circadian rhythms. The artificial light simulates the sun and helps cue your body to be awake.
Once you arrive at your new destination, you may use this treatment to help you stay awake during periods of drowsiness so your body can better adjust.
Melatonin
Melatonin is a hormone your body naturally produces in the hours before bedtime. You can take over-the-counter (OTC) melatonin supplements to trigger sleep when your body is fighting it.
Melatonin is fast-acting, so take it no more than 30 minutes before you’re able to sleep.
Make sure you can also sleep a full 8 hours when you take it. Melatonin may make you drowsy if you wake up before the effects have worn off.
Sleeping tablets
If you experience insomnia when you travel, or if you have difficulty sleeping in new places, talk with your doctor about sleeping pills.
Some of these medications are available as OTC products, but your doctor can prescribe stronger versions if necessary.
Sleep medication has several side effects, so be sure to talk with your doctor and understand what they are before you take anything.
Eat at standard mealtimes
A study found that altering when you eat can help your body adjust to jet lag. Your body may signal hunger at times close to when you would typically eat. If you can, ignore those hunger cues.
Eat at the appropriate time for your new time zone to help your body follow the new cues. The foods you eat can also affect your quality of sleep once you do go to bed.
Take a hot bath
Take a relaxing hot bath or shower before you go to bed. This can help your body wind down and fall asleep faster.
Other home remedies
A good night’s sleep is a treatment that cures a lot of ills. Here are some tips to follow before you travel:
- Rest well before you travel and do not start your journey sleep deprived.
- Have a light dinner a few hours before you plan to go to bed.
- Avoid computer, TV, and phone screens for a few hours before you sleep.
- Dim the lights a few hours before bedtime.
- Drink chamomile tea or try relaxing essential oils like lavender to promote sleep.
- Get a full night of sleep on your first night at the new location.
- Reduce distractions by turning off phones and silencing electronics.
- Use earbuds, noise machines, and eye masks to eliminate noise and light.
- Adjust your schedule accordingly.
It may take several days for your body to adjust to the new time zone. Adjusting your eating, working, and sleeping schedules right away can help speed up the process.
While you adjust, you may experience symptoms of jet lag. Jet lag will likely end in a few days after you arrive.
Give yourself time to adjust to the new schedule, and you will still be able to enjoy your trip.
Share
Related Health Facts
Important Notice
Doctallpedia is ONLY a resource center with information on the symptoms, prevention and treatment of common health problems. Doctallpedia should not be a substitute for proper diagnosis, consultation or medical advice from a doctor or other licensed medical practitioners. The information provided on Doctallpedia are based on available data and is solely for reading and general knowledge. External website links and videos are not the property of Doctall and are only provided for further reading. Information on Doctallpedia should NOT be used for self-diagnosis or as a substitute for proper medical care.
In the event of similar symptoms, kindly book an appointment to see a certified professional for medical advice.
Below is a list of sources referenced in the Health Facts for additional reading:
Doctall has collated the information contained within this factsheet from several reputable sources listed here
No comment yet, add your voice below!