Shift Science: Fatigue Monitor

Shift work wrecks sleep, and the tiredness builds up in ways you can't feel. Shift Science reads the work calendar you already keep and predicts your alertness across the next two weeks, so you can see the rough patches coming and plan around them. Point it at your schedule and it works out when you'll realistically be able to sleep around your shifts, then models how alert you're likely to be, hour by hour. WHAT IT DOES • Predicts your alertness (0–100) for the next 14 days on a scrollable timeline • Shows your current level at a glance, in plain English • Warns you before a predicted low — and before a drive home that looks unsafe • Evidence-based tips: when to nap, when to use (and stop) caffeine, how to use light on nights, and how to recover after a block of nights • Tracks the sleep debt and body-clock drift that build up across a run of shifts BUILT ON REAL SCIENCE Shift Science models the same three processes (sleep pressure, the body clock, and sleep inertia) behind the biomathematical fatigue models used in aviation and rail. It even accounts for how your body clock slowly re-adjusts when you rotate onto nights. We link to the source research papers inside the app so you can read it for yourself. MADE FOR SHIFT WORKERS Nurses, doctors, paramedics, drivers, pilots, firefighters, control-room and factory teams: anyone whose sleep is at the mercy of a rota. YOUR DATA STAYS ON YOUR DEVICE Everything runs on your iPhone. Your calendar and any sleep data are read on-device to make the prediction and never leave it, are never uploaded, and are never sold. • Optional: connect Apple Health to base predictions on your recorded sleep • Log a sleep or nap by hand to override the estimate. • No account. No sign-up. No ads. TRY IT WITHOUT A CALENDAR Explore built-in sample patterns — a block of nights, quick turnarounds, back-to-back doubles — to see how different rotas play out before connecting your own. Shift Science gives estimates to raise your awareness. It is not a medical device or a certified fitness-for-duty system and must not be the sole basis for any safety decision.