Why eastbound jet lag hurts more

A body clock runs slightly longer than 24 hours. Lengthen the day by flying west and the system copes. Shorten it by flying east and the system rebels: sleep comes hours before the brain expects it.

Brussels sits in Central European Time (CET in winter, CEST in summer). From New York the jump forward is 6 hours. From Tokyo it is 7 or 8. From Kinshasa or Johannesburg the change is zero or one hour, barely a ripple.

Brussels to New York (westbound): the forgiving direction

Land in the afternoon. The body feels like it is early evening in Brussels. That works.

Stay awake until 22:00 or 23:00 New York time. No nap at check-in. Push through, sleep once, wake roughly synced to the East Coast.

Get afternoon sunlight. Even 30 minutes of daylight after arrival anchors the new schedule. Land in darkness? Bright indoor light works as a backup.

The common failure: crashing at 17:00, waking at 02:00, spending three days on Brussels hours. Keep moving until local bedtime.

New York to Brussels (eastbound): the red-eye problem

Most New York to Brussels flights depart around 20:00 to 22:00 and land at Brussels Airport (BRU) between 07:00 and 09:00 local time. Six hours vanish overnight.

Bright light on arrival is the fix. On 21 June, Brussels sunrise is 05:28. On 21 December, it is 08:42. Either way, the first hours after landing are the best tool. Go outside. Walk. Eat breakfast in daylight. Do not close the curtains and sleep until noon.

Eat a proper breakfast at Brussels time. Meal timing is a strong clock signal. A full breakfast at 08:00 tells the metabolism the day has started.

The common failure: arriving exhausted, falling asleep at the hotel at 10:00, waking at 16:00, eating dinner at 22:00 when restaurant kitchens have closed.

Brussels to Tokyo (eastbound): losing a third of a day

The flight runs 11 hours east. In July, Tokyo is 7 hours ahead of Brussels. In January, it is 8 hours ahead.

Start adjusting three days before departure. Shift bedtime and wake time 1 to 2 hours earlier each day. Normally wake at 07:00? Wake at 05:00 on departure day. The pre-adjustment cuts the post-arrival workload.

On the plane, set a watch to Tokyo time immediately. Eat meals at Tokyo meal times, not Brussels meal times. Sleep when the cabin lights dim, even if it is noon in Brussels.

Arrive and stay awake until 21:00 Tokyo time. Exhaustion is the point. One full day of activity, one solid night of sleep, and the body is largely realigned.

The common failure: landing at 15:00, napping at 17:00, waking at 23:00, staying wide awake all night. Then the whole trip runs on Brussels time.

Tokyo to Brussels (westbound): midday arrival helps

Depart Tokyo in the morning, land at BRU early afternoon, typically 13:00 to 15:00. The body thinks it is 20:00 to 23:00 Tokyo time. Late side of the day.

Stay active until dinner. Walk, have a coffee, eat at 19:00 Brussels time. By 22:00 sleep comes, and the next morning starts close to Brussels time.

No caffeine after 16:00. A body clock already fighting to sleep does not need help staying awake until 02:00.

The common failure: a three-hour nap on arrival, waking at 18:00, unable to sleep until 03:00. The first day is lost to grogginess.

Africa routes: same or ±1 hour

Brussels is a major European hub for African connections. The time difference is small or nonexistent.

  • Kinshasa (DRC): same time zone as Brussels in winter (UTC+1). In summer, Kinshasa stays on UTC+1 while Brussels moves to UTC+2. Brussels runs 1 hour ahead.
  • Johannesburg (South Africa): 1 hour ahead of Brussels in winter, same time in summer.
  • Dakar (Senegal): 1 hour behind Brussels in winter, 2 hours behind in summer.

No special strategy is needed. Eat and sleep on local time from the moment you land. The only risk is confusing the clock change when connecting through a hub like Casablanca or Cairo.

The common failure: overthinking it. Melatonin and a light schedule are unnecessary for a one-hour shift. Eat dinner at the right time.

Within Europe: no jet lag on north-south routes

London, Paris, Amsterdam, Berlin, Rome to Brussels: zero or minimal time change. London is 1 hour behind Brussels year-round. Paris and Amsterdam are identical.

North-south flights (Brussels to Oslo, Brussels to Madrid) have no time change at all. The only adjustment is to meal times when coming from southern Europe, where dinner sits at 21:00 rather than 19:00.

East-west routes within Europe (Brussels to Lisbon, 1 hour behind) are a small shift. Treat it like a daylight saving change. One day of adjustment, not three.

Light, meals, and movement: the three tools

  1. Light is the strongest signal. Morning light shifts the clock earlier. Afternoon light shifts it later. Eastbound to Brussels: get morning light. Westbound from Brussels: get afternoon light.

  2. Meal timing reinforces the schedule. Eat breakfast within an hour of waking on the new time. Do not eat a large meal at 03:00 local time because the stomach thinks it is 09:00 at home.

  3. Exercise helps. A 30-minute walk in daylight does more than sitting in a bright hotel room. Movement and light together beat either alone.

The common failure: relying on sleeping pills to force sleep at the wrong time. That treats the symptom. Fix the light and meal timing first.

Brussels Airport (BRU) as a hub

BRU handles direct flights to New York (JFK, Newark), Tokyo (Narita), Dubai, and over 20 African destinations. Connecting through BRU to Africa or Asia means the jet lag strategy depends on the origin, not the destination.

Flying New York to BRU to Kinshasa: face the 6-hour shift from New York to Brussels, then zero change from Brussels to Kinshasa. Adjust to Brussels time at BRU. Do not try to stay on New York time through the connection.

Flying Tokyo to BRU to New York: face the 8-hour shift from Tokyo to Brussels, then a 6-hour shift from Brussels to New York. The worst case. Adjust to Brussels time during the layover, then readjust to New York time on arrival.

The common failure: trying to stay on a home time zone through a multi-leg journey. That works for short layovers. It fails for long ones. Pick the time zone of the final destination and start adjusting from the first flight.