Sleeping on an international flight comes down to controlling four things: when you sleep, where you sit, what you bring, and what you put in your body. Most people treat in-flight sleep as something that either happens or doesn’t, but with the right setup, you can reliably get several hours of rest and arrive in much better shape. Here’s how to stack the odds in your favor.
Time Your Sleep to Your Destination
The single most important decision isn’t your pillow or your playlist. It’s choosing when during the flight to sleep. Your goal is to sleep when it’s nighttime at your destination, not when it’s nighttime at home. This starts the process of shifting your internal clock before you even land.
If you’re flying east (say, New York to London), you need to push your body clock earlier. In the days before your flight, try shifting your bedtime and wake time one hour earlier per day. On the plane, sleep during the first half of the flight, which typically aligns with nighttime in Europe. If you’re flying west (London to Los Angeles), the opposite applies: stay awake during the early portion of the flight and sleep later, since you’re chasing the sun and need to push your body clock in the other direction.
This sounds simple, but it requires discipline. You may need to resist falling asleep right after takeoff on a westbound flight, even if you’re tired. That short-term discomfort pays off enormously when you land.
Book a Window Seat
A window seat gives you three advantages that no other seat can match. First, you can lean your head and body against the fuselage wall, which provides a stable surface for your neck and head instead of bobbing in open air. Second, you control the window shade, so you can block light on your schedule rather than being at the mercy of someone else’s preference. Third, and perhaps most valuable, nobody needs to climb over you to use the bathroom. Aisle passengers get woken up repeatedly when their row-mates need to get out, and on a 10-hour flight, that can mean three or four interruptions.
The tradeoff is that getting up yourself becomes harder. If you’re someone who needs to move frequently, this matters. But for sleep purposes, the window seat wins decisively.
Block Noise and Light Completely
Airplane cabins are loud. Engine noise, air circulation, conversations, and service carts create a constant wall of sound that sits well above the 30-decibel background level your brain needs for deep sleep. Noise-canceling headphones or well-fitted foam earplugs are non-negotiable. Noise-canceling headphones handle the low-frequency engine drone especially well, while earplugs are better for people who find headphones uncomfortable to sleep in. Some travelers use both together.
For light, a contoured sleep mask that sits off your eyelids works far better than the flat fabric kind airlines sometimes hand out. Look for one with a molded nose bridge that blocks the gap where light leaks in from below. Even dim cabin lighting is enough to suppress your body’s natural melatonin production, so complete darkness matters more than you might expect.
Dress for Temperature Swings
Cabin temperatures fluctuate throughout a flight, sometimes noticeably between the boarding phase, cruising altitude, and descent. Layers are the only reliable solution. A base layer like a light t-shirt or tank top, paired with a warm sweater or long cardigan, lets you adjust without digging through your carry-on. Warm socks make a surprising difference since your feet lose heat quickly, especially if you’ve taken your shoes off. A large scarf or lightweight blanket can double as an extra layer or a pillow in a pinch.
Loose-fitting pants or leggings with some stretch are worth the outfit compromise. Anything with a stiff waistband or tight seams becomes increasingly uncomfortable as your body swells slightly at altitude.
Use Compression Socks for Comfort
Compression socks gently squeeze your calves to help blood flow back toward your heart, counteracting the effects of sitting motionless for hours. They reduce leg swelling and that heavy, restless feeling in your lower legs that can make it hard to settle into sleep. You can safely wear them for the entire flight. They’re especially useful on flights over eight hours, and they’re one of those items that seem excessive until you try them once and never fly without them again.
Get Caffeine and Alcohol Timing Right
Both caffeine and alcohol disrupt sleep quality when consumed in the hours before you plan to rest, and on a long flight, the timing window is tighter than you think. Caffeine has a half-life of about five to six hours, meaning half of what you drank is still active in your system that long after your last cup. If you plan to sleep three hours into a 10-hour flight, your last coffee should be well before boarding.
Alcohol is trickier because it makes you feel drowsy but fragments your sleep cycles. A glass of wine might help you fall asleep faster, but you’ll wake up more often and feel worse when you land. The dehydrating effects of alcohol are also amplified in the already-dry cabin air. Your best bet is water and nothing else in the hours leading up to your sleep window.
Consider Low-Dose Melatonin
Melatonin can help signal to your body that it’s time to sleep, but the dose matters more than most people realize. The CDC notes that 0.5 to 1 milligram is often sufficient to produce a circadian shift, and doses above 5 milligrams are not recommended because excess melatonin lingers in your system and can end up active at the wrong time of day as your body processes it. Most drugstore melatonin comes in 3, 5, or even 10 milligram tablets, so you may need to cut pills or seek out lower-dose options.
Timing also matters. Take it shortly before your planned in-flight sleep period. If you take melatonin when your internal clock thinks it’s early evening, it helps shift your rhythm earlier, which is useful for eastward travel. If you take it when your body clock thinks it’s morning, it shifts your rhythm later, which helps with westward travel. Taking it during the window when your body is already producing melatonin naturally (roughly 12 a.m. to 5 a.m. body-clock time) is less effective because you’re adding to what’s already there.
Be Cautious With Stronger Sleep Aids
Prescription and over-the-counter sleep medications can impair mental processing and reaction times even after you feel fully awake. The FAA takes this seriously enough to require minimum wait times between a pilot’s last dose and flying duties. For passengers, the concern is different but real: if you’re deeply sedated during turbulence or an emergency, your ability to respond is compromised. Heavy sedation also increases your risk of blood clots because you’re even less likely to shift position or get up and move.
If you do use a sleep aid, try it at home first to understand how it affects you. Never combine it with alcohol, and opt for the shortest-acting option available so you’re clearheaded by landing.
Set Up Your Space Before Takeoff
Once you’re settled in your seat, do everything possible to create your sleep environment before the plane takes off. Put your sleep mask around your neck, have your earplugs or headphones ready, stow your bag so there’s maximum legroom, and recline as soon as it’s permitted. Loosen your shoes or switch to the compression socks. Fill your water bottle so you can hydrate without flagging down a flight attendant.
If you plan to skip the meal service in favor of sleep, let the flight attendant know early. Otherwise, you’ll be woken up for a dinner tray you don’t want. Some travelers eat a light meal in the terminal before boarding specifically to avoid this interruption.
Use Light Strategically After Landing
What you do in the first few hours after landing determines how quickly you adjust. If you flew east, get bright light exposure in the first three to four hours after you wake up at your destination. Morning sunlight is ideal. If you flew west, seek bright light in the three to four hours before your new bedtime instead. This reinforces the clock shift you started on the plane.
Equally important is avoiding light at the wrong time. After eastward travel, wearing sunglasses in the late afternoon and evening helps prevent your clock from shifting back. After westward travel, avoid bright morning light for the first day or two if possible. A free jet lag calculator, which the CDC recommends using, can personalize these light and dark windows based on your exact route and time zones crossed.