How to recover from jet lag faster (and what your recovery data shows)
Cross enough time zones and your body keeps running on the clock you left behind. For a few days your sleep is broken, your energy is flat, and your wearable shows it — lower HRV, higher resting heart rate, a readiness score in the basement. None of that means something is wrong; it's jet lag, and there are concrete ways to shorten it.
On this page
What jet lag actually is
Your circadian clock — the internal timer that drives sleep, alertness, hormones and body temperature — is set to your origin time zone. Fly across several, and that clock is suddenly out of step with the local day: it's telling you to sleep at noon and wake at 3 a.m. Jet lag is that misalignment. A useful rule of thumb is that the clock re-syncs at roughly one time zone per day, so a six-hour shift can take the better part of a week to fully settle.
Why your numbers drop for days
While you're misaligned, your nights are fragmented and your nervous system is under load — so the recovery signals dip together: heart-rate variability falls, resting heart rate rises, sleep gets shorter and lighter, and any readiness or recovery score leans low. The important thing is to read it correctly: this is the expected biology of crossing time zones, not illness or overtraining. Treating a jet-lagged low like a red flag — or trying to train through it hard — usually backfires.
How to recover faster
The clock resets fastest with the right cues. *Light is the strongest lever — get bright daylight at the right end of your new day and avoid it at the wrong end (morning light helps you adjust eastward; evening light helps westward). Shift your sleep schedule to the destination immediately — eat, sleep and wake on local time from day one, even if it's rough. Keep caffeine* to your new morning and off the back half of the day, stay hydrated, and get outside and moving. Short, well-timed naps (20–30 min) can take the edge off without wrecking the night. Some people use low-dose melatonin to nudge the clock — that's worth discussing with a clinician; this is general information, not medical advice.
Why flying east is harder than west
Most people adjust more easily flying west than east. Going west lengthens your day, and your internal clock naturally drifts a little longer than 24 hours, so "staying up later" is the easier direction. Flying east forces you to fall asleep and wake earlier than your body wants, which it resists. Expect an eastward trip to take a day or two longer to shake off, and front-load the morning-light and earlier-bedtime habits accordingly.
Let your tracker reframe the dip, not alarm you
Vitra notices when you've crossed time zones — it reads the shift straight from the times your sleep starts and ends, and when that jumps by three hours or more it enters a travel mode for the following days. During that window it reframes your lower HRV, higher resting heart rate and softer readiness as the normal biology of jet lag rather than flagging them as warning signs, so you don't misread a travel dip as illness or push a hard session you'll regret. It also knows east-vs-west and how many days since the shift. Everything is worked out on your own machine from your Oura data.
Frequently asked questions
- Khalsa et al. (2003), Journal of Physiology: the human phase response curve to bright light — light before your temperature minimum delays the clock, light after it advances the clock
- Lewy et al. (1998): the human phase response curve to melatonin runs about 12 hours out of phase with the curve to light
Pedro Thomaz builds Vitra, a desktop app that reads Oura data against your own baseline instead of a population average. He has worn a ring daily for years and reads these same numbers every morning — which is where most of what is written here comes from. Vitra is not a medical device and nothing on this blog is medical advice.
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