Jet Lag Is Not Inevitable: What Science Says About Managing It

It's a tempting logic: a glass of wine blunts anxiety and induces drowsiness. But sleep induced or deepened by alcohol is physiologically shallow. Research consistently shows that alcohol suppresses REM sleep, the restorative phase most critical for cognitive recovery. Arriving dehydrated and REM-deprived is a worse starting point than arriving simply tired. If sleep on the plane is the goal, a more effective strategy involves dimming your screen, using an eye mask, and—if appropriate for you personally and discussed with a doctor—a low dose of melatonin timed to your destination's night cycle.

The human circadian rhythm naturally runs slightly longer than 24 hours—closer to 24.2 hours on average. That means it's easier to delay your clock (stay up later, as in westward travel) than to advance it (go to bed earlier, as in eastward travel). Flying New York to London means your body must shift forward by five to six hours, essentially asking your clock to sprint ahead. Flying in the reverse direction allows it to drift back more naturally. Travelers crossing many time zones eastward typically need more recovery days and benefit most from targeted light management in the mornings after arrival.

Melatonin is a hormone naturally produced by the pineal gland that signals darkness and sleep onset—it doesn't force sleep the way a sedative does. Taking it at the wrong time (say, mid-afternoon in your origin time zone) is unlikely to help and may confuse the clock further. Research, including reviews published in sleep medicine literature, suggests melatonin is most useful taken close to the target destination's bedtime for the first few days after arrival, particularly after eastward travel. Appropriate dosage and timing is something to discuss with a healthcare professional, especially for people with underlying health conditions or those taking other medications.

The pull toward a long nap after an overnight flight is almost irresistible—but surrendering to it fully can backfire. Sleeping several hours in the early afternoon of your destination essentially tells your body that afternoon is nighttime, making it harder to fall asleep at the local hour. If rest is genuinely necessary, chronobiologists generally suggest limiting naps to 20–30 minutes and timing them to avoid the late afternoon window. Pushing through to a local bedtime—supported by daylight exposure and light activity—typically accelerates adaptation more reliably than unstructured rest.

A rough rule of thumb used in sleep research is that the body adjusts roughly one time zone per day, though this varies considerably. Some people—often younger adults—readjust faster; others, including older travelers, may experience more pronounced and prolonged symptoms. Chronotype (whether you're naturally an early riser or a night owl) also plays a role. Framing jet lag as a quick inconvenience can lead travelers to under-prepare and overcommit their first days at a destination, which compounds the problem. Building a light buffer day into itineraries is a strategy seasoned travelers rely on for exactly this reason.