Circa: Jet Lag Planner

Circa helps your body clock catch up with your destination, so you feel like yourself sooner. Jet lag happens because the clock in your brain keeps running on home time. Bright light at the right moment moves that clock towards your new time zone; light at the wrong moment pushes it the other way. Circa works out exactly when, for your flights and your usual sleep, and turns it into a simple plan. HOW IT WORKS • Add your flights: look up a flight number, paste a booking email or crew roster, or enter flights by hand. • Follow the timeline: each day shows when to get bright light, when to keep it dim, when to sleep, nap and have caffeine. Tap any bar to see why. • Get reminders: notifications tell you what to do next, so you don't need to keep opening the app. • Check in and the plan adapts: missed some light or slept at the wrong time? Say so, and Circa re-works the rest of your plan. BUILT FOR REAL TRIPS • Multi-leg trips, onward and return flights • Short stays: keep your home clock instead of adapting when that's less tiring • Gentle mode when you can't follow a full plan • Plans for people you travel with, including children (no caffeine or melatonin advice for kids) • Crew mode for pilots and cabin crew • Night shifts: add a run of nights or paste your rota, and get light, dark, sleep and caffeine timing to get through them and switch back PRIVATE BY DESIGN No account, no ads, no tracking. Your trips and plans stay on your phone. Only a flight number and date are sent when you choose to look up a flight. Circa's advice is based on published circadian research on light, sleep and melatonin timing. It is general wellbeing guidance and not medical advice; speak to a doctor about melatonin or if you have a sleep or health condition.

First release of Circa for Android: day-by-day jet lag plans for light, sleep and caffeine, flight number lookup, itinerary and roster paste, reminders, and night shift plans.