Daylight Saving, Jet Lag and Sleep: Staying Healthy When You Work Across Time Zones

Working across time zones can wreck your sleep if you are not careful. These habits help you stay alert, healthy and productive, whether you move often or stay in one place.

The hidden cost of odd hours

Remote workers who serve clients across continents often talk about calendars and tools, but the biggest cost of time zone differences is physical. Your body has a circadian rhythm, an internal clock that tells you when to be alert and when to sleep. When your work schedule regularly forces you awake at hours that clash with that clock, your sleep quality, mood and health can suffer.

This guide is for anyone whose work crosses time zones, whether you are a nomad who changes country every few weeks, a remote worker with a night call twice a week, or someone who simply feels the shift when clocks change. The advice is general and not medical, but it reflects widely accepted sleep science.

How your body clock works

Your internal clock is set mainly by light. Bright light in the morning tells your body that the day has begun, while darkness in the evening helps trigger the release of melatonin, a hormone that signals sleep. Meal times, exercise and social activity also play a role.

When you travel across time zones, your external environment shifts quickly but your internal clock moves slowly. A rough guide is that the body adjusts by about an hour a day, though this varies between individuals and depends on whether you travel east or west. Travelling east, which shortens your day, is usually harder than travelling west.

Even without travel, regular late-night or very early meetings can create a similar effect, sometimes called social jet lag.

Protect your sleep first

Sleep is the foundation of performance. Most adults need around seven to nine hours. A few principles help.

Keep a regular sleep window where possible, even on days with unusual calls.
Make your bedroom dark, cool and quiet. Blackout curtains and an eye mask help, particularly when you need to sleep during daylight.
Limit screens before bed. Bright light from phones and laptops can delay sleep.
Be careful with caffeine. It stays in your system for hours. Avoid it in the afternoon and evening unless you are deliberately staying awake.
Avoid heavy meals and alcohol close to bedtime. Alcohol may help you fall asleep but disrupts sleep later in the night.

If you have late-night calls

Regular late-night calls are one of the biggest problems for people working across continents. Some ways to cope:

Shift your whole schedule. If you have a call at 10 pm, start your day later so that you still get enough sleep.
Rest earlier in the day. A short nap in the afternoon, of around 20 to 30 minutes, can help.
Keep lighting dim after the call to let your body wind down.
Limit these calls. Try to confine them to certain days, and rotate with colleagues.
Take a recovery day after a run of late nights if you can.

If you have very early calls

For early calls, work backwards. If you need to be alert at 5 am, you may need to go to bed by 9 pm. Prepare the night before by setting out what you need, and use bright light after waking.

Avoid relying on repeated alarms and snoozing, which fragments sleep. A regular, early bedtime is more effective than trying to catch up at weekends.

Moving between time zones

If you move to a new country, you can help your body adjust.

Use morning light after travelling east and evening light after travelling west.
Shift your schedule gradually in the days before you go, moving bedtime in the direction of the new time zone by an hour or so each day.
Adopt local meal times soon after arrival.
Stay hydrated and move around on flights.
Take a short nap if needed, but keep it under 30 minutes and early in the afternoon.
Be patient. Expect a few days of reduced concentration, and plan lighter work.

Some people use melatonin supplements to help adjust. Speak to a doctor or pharmacist before using them, especially if you take other medication or have health conditions.

Daylight saving changes

Clock changes can disrupt sleep for a few days. In many countries, daylight saving begins in spring, when clocks go forward and you lose an hour, and ends in autumn, when clocks go back.

To ease the transition:

Shift your sleep schedule gradually by 10 to 15 minutes in the days before a change.
Get morning light after the clocks change.
Check recurring meetings, since the gap between regions that observe daylight saving on different dates can change by an hour for a few weeks.
Warn clients and colleagues if your availability shifts.

If you work with people in regions that do not observe daylight saving, such as parts of Asia, remember that your relative time difference will change.

Food, exercise and light

Lifestyle habits support your body clock.

Light: Get outdoors in daylight, especially in the morning. If you work in a dim room, consider a bright desk lamp during the day.
Exercise: Regular exercise improves sleep, but vigorous workouts close to bedtime can keep some people awake. Experiment with timing.
Meals: Eat at regular times and try not to skip meals, since this helps signal the schedule to your body.
Hydration: Dehydration can make fatigue worse.

Know the warning signs

Occasional tiredness is normal. But if you notice persistent sleep problems, mood changes, difficulty concentrating, or reliance on large amounts of caffeine or alcohol to cope, take it seriously. These signs may suggest that your schedule is unsustainable.

Consider changing your hours, negotiating with your employer or clients, or moving to a time zone that fits better. If symptoms persist, talk to a healthcare professional.

Practical tools

Sleep trackers or journals to notice patterns.
Blackout curtains and eye masks.
White noise machines or earplugs.
Light therapy lamps for dark winters, used with advice.
Calendar blocking to protect sleep and recovery time.

Talk to your team

Many people do not mention how hard odd-hour meetings are, because they fear appearing unprofessional. In practice, managers often do not realise the impact. Explain which times are hardest, offer solutions, and suggest sharing the burden.

Frequently asked questions

How long does it take to adjust to a new time zone? A common rule of thumb is about one day per time zone crossed, but it varies a great deal.

Is it bad to work at night regularly? Night work is associated with health risks for some people, especially when sleep is poor. If you must do it, protect your sleep and seek advice if you have health concerns.

Do naps help? Short naps of 20 to 30 minutes can improve alertness. Long naps late in the day can interfere with night-time sleep.

Should I use melatonin? Some people find it helpful for jet lag, but it is not suitable for everyone. Ask a doctor or pharmacist.

Summary

When you work across time zones, protect your sleep as carefully as your calendar. Use light, regular routines and short naps to support your body clock, plan for clock changes, and share the burden of awkward hours with your team. If your schedule is making you unwell, take it as a sign to change it.

This article provides general information, not medical advice.