Nothing is more humbling for a frequent traveller than landing after a long-haul flight and realising that your body missed the time-change memo. There you are, feeling like a phone on one per cent, while everyone around you goes about their day functioning perfectly normally.

That is jet lag. Your internal clock is stuck on the time of your departure city, while the sun has got its hat on and you’re definitely not singing hip hip hooray. Wide awake at 3am, gagging for a nap at 3pm, and about as sharp as the knife from the flight that got you into this mess. The good news is that some wearables and sleep gadgets are starting to treat jet lag…

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