Post Nights is an alarm clock for nurses and other rotating shift workers. It wakes you at the end of every sleep window, and it sets those windows from your real roster rather than from a template.
The wake-up is your phone's own system alarm, set on the phone itself. It sounds when your phone is on silent, it comes back after the phone restarts, and battery saver does not stop it. If your phone cannot do that, the app tells you on the screen instead of letting you find out by oversleeping. To stop it you drag it onto a target — a gesture a half-asleep hand does not make by reflex.
WHAT IT SOUNDS LIKE
A low, buzzing tone built on a 520 Hz square wave. In a sleep study, 7 in 100 deep sleepers slept through that wave, against 43 in 100 for a typical high alarm tone. It is not meant to be pleasant. Prefer your phone's own alarm sound? You can choose it in the app, and switch back any time.
HOW THE ALARM TIMES ARE CHOSEN
Night shifts move your schedule, not your body clock. Post Nights reads your roster, estimates where your body clock actually is, and places each sleep window against that clock rather than the one on the wall — in the dark, and at the same hour on every day of a run.
Around your sleep, it tells you:
• When to nap, so you arrive at handover rested instead of already sixteen hours awake.
• When to put sunglasses on. Sunrise on the drive home is the biggest unwanted clock signal in a night worker's week.
• When to seek light, and when to avoid it.
• On days off, whether to hold your night hours or plan the way back to days.
• Before the drive home, how many hours you will have been awake — information, not a verdict.
Every instruction carries its reason underneath it.
YOUR ROSTER, IN ONE SCREEN
Type your pattern, tap the days, pick the calendar it is already in, or connect the calendar feed your employer or scheduling app publishes. Or photograph the printed unit sheet: it is read on your phone, and only your own shifts leave it. Press and hold a day to give it its own hours. With a connected feed, changes are picked up for you and your plan and alarms follow them.
AFTER EACH BLOCK
When a run of shifts ends, a short report: how you slept against what the plan asked, the naps you took, how it compares with the block before, and one cheap thing to change next time. Your own numbers, never a score.
SHARE YOUR WEEK
A private link that shows a partner or housemate your rest times for the week — never your shift hours. Turn it off at any time; it expires after 90 days.
A HOME-SCREEN WIDGET
Your next rest, counting down, on the home screen.
THE HONEST PART
The body-clock estimate is based on published circadian research — the Forger–Jewett–Kronauer model of the human circadian pacemaker — and its model is accurate to about an hour in laboratory studies that measured the light people saw; we estimate yours from your roster, which is less precise. That is enough to place a nap and a pair of sunglasses. It is never enough to state a precise body-clock time, and we never will. Some rosters are hard on human physiology whatever you do; Post Nights plans the best sleep available inside the one you were given, and says so when it cannot.
YOUR DATA
A roster says when you are home and asleep, so it is treated as sensitive. A connected feed link is stored encrypted. Nothing is sold, nothing is shared with advertisers, and nothing is reported to your employer. You can export everything, or delete your account, from inside the app.
SUBSCRIPTION
Try it free first, then choose a yearly or monthly subscription. Cancel any time in Google Play.
Post Nights is not a medical device. It does not diagnose, treat, cure or prevent any medical condition, and it does not assess whether you are fit to work. For medical advice, a diagnosis or treatment, speak to a healthcare professional.
Alarm clock and sleep scheduler for rotating shift workers