RAY

Move your sleep without a flight

Updated 2026-08-17

Jet lag without the flight is the same problem: your body clock is in one place and your schedule is in another. A new job with a 6am start, a rota that rotates, or a night that has quietly drifted to 3am — the machinery that fixes a time zone fixes these too.

Why “just go to bed earlier” fails

Your clock runs slightly longer than 24 hours, so it drifts later on its own. Going to bed two hours earlier tonight doesn’t work: you lie there awake, because your body isn’t producing melatonin yet and your core temperature is still high.

Sleep follows the clock, not the other way round. You have to move the clock first — with light, dark, and a bedtime that walks rather than jumps.

The pace

About an hour a night if you’re pulling earlier, up to 1.5 if you’re pushing later. Early birds pull earlier more easily; night owls push later more easily.

That means a two-hour move takes two nights, and a five-hour move takes most of a week. Knowing that in advance is the difference between a plan and a disappointment.

What to actually do, moving earlier

  1. Wake 30–60 minutes earlier than yesterday, not two hours.
  2. Bright light straight after waking — outside if it’s up, a 10,000-lux box if it isn’t. Only after CBTmin, which sits about two hours before your habitual wake.
  3. Last coffee six hours before the bedtime you’re aiming for.
  4. Melatonin 0.5 mg, five hours before that bedtime, if you use it.
  5. Dim everything for the last two hours, and keep the new wake time on days off — one late weekend undoes several nights.

Rotating shifts

Rotating forwards — mornings, then afternoons, then nights — is easier than backwards, for the same reason flying west beats flying east. If you have any say in the rota, that’s the ask worth making.

Ray does this without a flight

Pick “a new rhythm” instead of a trip, set the wake time you’re aiming for and the date you want to be settled by, and it paces the move across the nights you have — honouring the date rather than racing to it.

Related: what CBTmin is · light timing

Related

What CBTmin is, and why light timing flips around itYour core body temperature minimum sits about two hours before you normally wake — and light before or after it moves your clock in opposite directions.Light timing for travelDaylight is the strongest signal you have. When it lands decides whether it helps or hurts, and a lamp works when the sun isn't up.Does melatonin help jet lag?Yes — but the timing matters more than the dose, and five hours before bed does something different from five minutes before.