The single most effective thing you can do to sleep with jet lag is time your light exposure and melatonin correctly for the direction you traveled. Most people treat jet lag as a willpower problem, forcing themselves to stay awake or sleep at odd hours, but it’s really a timing problem. Your internal clock is stuck in your old time zone, and specific cues can drag it forward or backward to match where you are now.
Why Your Body Resists the New Schedule
Your brain runs on a roughly 24-hour cycle that controls when you feel sleepy and when you feel alert. This cycle is anchored mainly by light hitting your eyes. When you cross multiple time zones in a few hours, your internal clock doesn’t move with you. It stays locked to the light-dark pattern of where you came from, which means your brain is releasing sleep-promoting hormones and dropping your core body temperature at the wrong local time.
Traveling east is harder than traveling west. Your internal clock naturally runs slightly longer than 24 hours, so stretching the day (as westward travel does) feels more natural than compressing it. Flying east forces your clock to jump ahead, which runs directly against that built-in tendency. This is why a six-hour eastward shift can leave you wide awake at 2 a.m. for several nights, while the same shift westward may only cause a day or two of early evening drowsiness.
Use Light as Your Primary Tool
Light is the strongest signal your brain uses to set its clock. Getting the timing right matters more than any supplement or sleep aid.
After flying east, you need to advance your clock, meaning push it earlier. Seek bright morning light in the new time zone, ideally sunlight, as soon as you can after waking. This tells your brain that morning has arrived and it’s time to shift. Avoid bright light in the late evening, which would confuse things by signaling that the day is still going.
After flying west, you need to delay your clock, pushing it later. Expose yourself to bright light in the evening at your destination and avoid early morning light for the first couple of days. This extends your biological day to match the longer local day you’ve inherited.
If you’ve crossed eight or more time zones, be careful. Your brain can misinterpret morning light as late-evening light (or vice versa) and shift in the wrong direction entirely. In extreme cases, wearing sunglasses during your first morning at the destination and seeking light later in the day can prevent this backfire.
Melatonin Timing by Travel Direction
Melatonin works, but only if you take it at the right time. Taking it at the wrong time can actually make jet lag worse by pushing your clock in the wrong direction.
A dose of 0.5 to 1 mg is often enough to produce a meaningful clock shift. Higher doses don’t necessarily work better, and anything above 5 mg can leave excess melatonin circulating at the wrong time of day as your body breaks it down. For eastward travel, take melatonin about 90 minutes before your intended bedtime in the new time zone. This nudges your clock earlier by reinforcing the natural rise in melatonin that signals nighttime. For westward travel, take it in the morning of the new time zone to push your clock later.
One important caveat: taking melatonin when your body is already producing its own (roughly between midnight and 5 a.m. on your internal clock) doesn’t do much. The signal is redundant. Time your dose for when your brain thinks it’s early evening (eastward) or morning (westward) for the strongest effect. If you’re unsure of your internal clock time, a simple rule is to count the hours of time zone difference and estimate where your body “thinks” it is.
What to Do on the Plane
Start adjusting during the flight by aligning your behavior with the destination’s local time. If it’s nighttime where you’re heading, try to sleep on the plane. If it’s daytime there, stay awake. This doesn’t fully reset your clock, but it prevents you from arriving even more out of sync.
Skip caffeine and alcohol during the flight. Both disrupt sleep quality, and alcohol in particular fragments the deeper sleep stages your brain needs. They also dehydrate you, which compounds the fatigue you’ll already feel on arrival. Stick to water.
Napping Without Sabotaging Your Night
The urge to nap after arriving can be overwhelming, especially if you landed in the morning after a red-eye flight. If you need to nap, keep it to 30 minutes or less. Longer naps allow your brain to enter deeper sleep stages, which makes waking up harder and, more importantly, steals sleep pressure from the coming night. You’ll end up wide awake at 1 a.m. wondering why you can’t fall asleep.
Set an alarm. Jet-lagged naps have a way of turning into three-hour crashes if left unchecked. Try to avoid napping after mid-afternoon local time, since even a short nap late in the day can delay your ability to fall asleep that night.
Eat Breakfast at the New Local Time
Meal timing acts as a secondary clock-setting signal. Research from Northwestern University found that eating a substantial breakfast aligned with the destination’s morning can measurably speed jet lag recovery. Your digestive system has its own circadian rhythms, and a morning meal helps anchor those rhythms to the new time zone. Conversely, eating a large meal late at night at your destination works against adaptation by telling parts of your body it’s still daytime.
The practical takeaway: even if you’re not hungry, eat something meaningful at breakfast time in the new time zone. Avoid late-night meals, especially in the first two or three days after arrival. Keeping your meal schedule consistent and anchored to local morning gives your body a second synchronizing signal alongside light.
When You’re Lying Awake at 3 A.M.
This is the hardest part of jet lag. You followed every recommendation, and you’re still staring at the ceiling in the middle of the night. This is normal, especially after eastward travel across five or more time zones. Your body adjusts at a rate of roughly one to one and a half time zones per day, so a nine-hour shift could take a full week.
If you’ve been lying awake for more than 20 minutes, get out of bed. Sit in dim light and do something low-stimulation, like reading a physical book. Avoid screens, which emit enough blue light to signal “daytime” to your brain. When you feel drowsy again, go back to bed. This prevents your brain from associating the bed with frustration and wakefulness, a pattern that can outlast the jet lag itself.
Keep the room cool, dark, and quiet. Blackout curtains or a sleep mask are especially valuable if local dawn arrives while your body still thinks it’s the middle of the night. Earplugs can help if the hotel or neighborhood is noisy during hours your body expects silence.
Prescription Sleep Aids: Short-Term Use Only
Some travelers use prescription sleep medications to force sleep during the first few nights. These can help you get functional rest while your clock catches up, but they don’t actually shift your circadian rhythm. You’ll still need light and melatonin timing to truly adjust. The FAA allows pilots to use sleep aids occasionally for circadian disruption, which gives a sense of how common and accepted short-term use is, but daily reliance isn’t recommended. If you’re considering this route, talk to your provider before your trip so you can test the medication at home first and know how it affects you.
Pre-Trip Preparation
If you have a few days before departure, you can start shifting your schedule in advance. For eastward travel, move your bedtime 30 to 60 minutes earlier each night for two or three nights before you leave. For westward travel, stay up a bit later. This won’t eliminate jet lag, but it shrinks the gap your body has to close after landing.
Combine this with shifted light exposure: if you’re heading east, get bright light earlier in the morning in the days before your trip. If heading west, seek evening light. Even a one or two-hour head start on the shift can make the first night at your destination noticeably easier.