Why does Pacific Time jet lag hit harder flying east?

A 14:00 ET departure lands in Los Angeles at 11:00 PT. Your body thinks it is 14:00. You are not tired. You push through to a local bedtime of 22:00, which feels like 01:00 ET. That is a 3-hour phase delay. Humans handle phase delays better than phase advances because the natural circadian cycle runs slightly longer than 24 hours. Stretching the day works.

The mistake: going to bed at your normal ET bedtime on the first night. 22:00 PT. That is 01:00 ET. You crash. You wake at 06:00 PT the next morning. Only six hours of sleep. Groggy.

Instead, aim for a 23:00 PT bedtime on night one. Get sunlight outdoors by 08:00 PT the next morning. That daylight signal resets your circadian rhythm faster than any sleep aid.

Why is Pacific Time jet lag worse returning east?

Coming back from Los Angeles to New York, you gain three hours. Your body must sleep three hours earlier and wake three hours earlier. A phase advance. You land at 22:00 ET after a 19:00 PT departure. Your internal clock says 19:00. You are alert when you should be winding down. You try to sleep at 23:00 ET. Your body says 20:00 PT. You lie awake.

The common advice fails. You cannot force sleep.

Use bright light within 30 minutes of waking. At least half an hour outdoors. Avoid bright light in the evening. A 0.5 mg melatonin supplement taken 6-8 hours before your desired bedtime may help, but check with a doctor first. The adjustment takes about one day per time zone crossed. Three days for the East Coast return.

West Coast to Europe: redeyes and Pacific Time jet lag

Flights from the West Coast to Europe are redeyes. They depart between 18:00 and 22:00 PT and arrive in Europe the next morning. You leave at 20:00 PT, fly through the night, land at 06:00 London time. Your body thinks it is 22:00 PT, which is 06:00 UTC. You must stay awake for the arrival day. That day is 18-20 hours long.

The eastbound lag is severe. Overnight travel, a lost sleep cycle, and an 8-hour difference to London or 9-hour to Paris. A double hit. Many travelers try to sleep on the plane and fail. Cabin lights come on for breakfast 90 minutes before landing.

Stay awake until the last two hours of the flight. Then sleep. Upon arrival, force yourself to stay awake until 21:00 local time. Walk in daylight. Do not nap in the afternoon.

Asia to West Coast: Pacific Time and the International Date Line

Flying from Tokyo to Los Angeles, you cross the International Date Line. Depart Tokyo at 17:00 JST. Arrive Los Angeles at 11:00 PT the same calendar day. You lose a calendar day eastbound. The flight is 10 hours. The time zone difference is 16 hours in summer, 17 hours in winter. Your body faces a 16-hour phase delay.

This is the most disorienting trip for Pacific Time travelers. You arrive in the morning local time. Your body says it is the middle of the night. Exhausted but needing to function.

Get sunlight immediately upon arrival. Do not go to sleep at 11:00 PT. Stay awake until at least 20:00 PT. If you nap, limit it to 90 minutes. Adjustment takes 5-7 days. Many business travelers on Asia, West Coast routes schedule a full recovery day before meetings.

Tijuana and San Diego: Pacific Time at the border

Tijuana and San Diego run on the same clock year-round. Mexico abolished daylight saving nationwide in October 2022. Border municipalities, including Tijuana and Mexicali, retained DST to stay synchronized with US Pacific Time. This is the only Mexican territory that follows US DST.

Zero time zone friction at the border. A 14:00 meeting in San Diego is 14:00 in Tijuana. Cross-border workers, shoppers, and medical tourists never convert times.

The risk: forgetting that the rest of Baja California and mainland Mexico do not observe DST. Traveling from Tijuana to Ensenada, the clock matches. Both are on Pacific Time. But if you go to Mexico City, the time difference changes by an hour twice a year. Check the date before you book.

When do Pacific Time clocks change?

Twice a year. Spring forward on the second Sunday of March. Fall back on the first Sunday of November.

In 2026: March 8 at 02:00 local, clocks go forward 60 minutes. November 1 at 02:00 local, clocks go back 60 minutes.

In 2027: March 14 and November 7.

The week after spring forward, scheduling errors spike. People arrive an hour late. Their phone updated. Their alarm clock did not. Traffic accidents increase in the first week, per traffic safety studies. If you are traveling to or from Pacific Time during these weeks, confirm all meeting times manually. Do not rely on automatic calendar conversions. The fall transition is less disruptive. You gain an hour. But circadian disruption still lasts 3-5 days.

Adjusting to Pacific Time: what works

Before you fly: Shift your sleep schedule by 30 minutes per day for 2-3 days before departure. Traveling east? Go to bed and wake up 30 minutes earlier each day. West? 30 minutes later.

On the flight: Set your watch to Pacific Time as soon as you board. Eat meals on Pacific Time. Drink water. Not alcohol or caffeine.

After arrival: Get outdoor light in the morning. Walk for half an hour. Avoid screens after 22:00 PT. If you must nap, limit it to 90 minutes before 15:00 PT.

For business travelers: Schedule important meetings after 10:00 PT for the first two days. Cognitive performance is worst between 02:00 and 06:00 body time.

The next clock change is March 14, 2027. Pacific Standard Time becomes Pacific Daylight Time at 02:00 local. A one-hour loss of sleep that Sunday. Plan flights and meetings for the following week accordingly.