Jet Laggard turns your itinerary into a light, sleep and caffeine schedule, built on the published circadian research rather than a rule of thumb someone posted on a plane.
Invite-only, for now.
Seek bright light 06:00–08:00
Avoid caffeine after 14:00
Melatonin, 22:30
A sample. Not your data — you haven't given us any yet.
Your body clock does not know you changed time zones. It finds out the hard way, at roughly a day per hour of shift, unless something moves it faster.
Light exposure, sleep timing and caffeine can move it — in the right order, at the right hour, in the right direction depending on whether you flew east or west. Get the order wrong and you can make the shift slower, not faster.
That is the part that does not fit on a napkin. Jet Laggard works it out per trip, from your actual outbound and return flights.
Outbound and return. That's the whole form.
Light, sleep and caffeine timing, modelled for that specific shift and direction.
Or don't. It won't take it personally, and it will still be there tomorrow.
The schedule comes from a phase-response-curve model of how light shifts the circadian clock — the same class of model used in circadian research — tuned per trip to your outbound and return itinerary, not a fixed table by time-zone count.
It is quietly serious science. The jokes are somewhere else in the app. They are never in the schedule.
Dry, not chirpy. The instructions stay literal — that part is health-adjacent and gets no jokes. Everything around it does.
"No trips. Enviable, in a way."
"Consulting the sun."
"Adjusted. You may now be insufferable about it."
Jet Laggard isn't open for self-serve signup. If you'd like in, email invitation@jetlaggard.com — or wait for an invite to land in your actual, correctly time-zoned inbox.