The Full Picture on Jet Lag, and What Actually Helps

Bringing together the pharmacological and behavioural research on jet lag up to that point, this review makes a distinction that's easy to lose in casual advice: travel fatigue, the general tiredness of a long journey, is not the same thing as jet lag, which specifically comes from the body clock being out of step with local time, and the two need different responses. The review confirms the now well-established asymmetry between directions, eastward flights are generally harder to adjust to than westward ones, because it's biologically harder to shift the body clock earlier than later, and lays out the evidence for what actually helps: appropriately timed light exposure, gradually shifted sleep schedules, and melatonin used correctly, over reaching for sleeping pills or stimulants, which the authors note are not supported as a reliable fix.

As a review rather than new data, its conclusions are only as strong as the individual studies it draws together, and travel medicine in this area has continued to develop since 2007. Its enduring value is as a clear-eyed synthesis: it resists the temptation to offer a single miracle fix and instead lays out, honestly, what has reasonable evidence behind it and what doesn't, which is precisely the kind of overview that's hard to find amid marketing claims for jet lag remedies.