OyasooHow to track your sleep on iPhone without an Apple Watch
You don’t need a watch or a ring to get a decent picture of your sleep. An iPhone can do it on its own, as long as you know what it’s measuring and where it runs out. There are four ways to go about it, and they differ less in accuracy than in how much effort they ask of you every night.
1. Write it down yourself
The oldest method still works. Note when you went to bed, roughly when you fell asleep and when you got up, in the Health app (Browse → Sleep → Add Data) or in a notes app.
It costs nothing and needs no permissions. The catch is memory: nobody knows exactly when they fell asleep, and after a week or two most people stop. If you only want to check one thing for a short while, say whether you’re really getting seven hours, a two-week log is fine.
2. The iPhone’s own sleep schedule
The Health app has a sleep schedule: a bedtime, a wake-up alarm and a Sleep Focus that quiets notifications. It’s useful for building a routine, but it’s a plan, not a measurement. It knows when you meant to sleep.
Some versions of iOS also offered an option to estimate time in bed from when you used your phone during that schedule. It only ever measured time in bed, only inside your planned hours, and whether you still see it depends on your iOS version (Health → Browse → Sleep → Full Schedule & Options → Options). Don’t count on it for nights that don’t follow the schedule, like a late evening or a lie-in.
3. A sleep app with the phone in your bed
Many sleep apps ask you to start them at bedtime and leave the phone on the mattress or the nightstand. They listen with the microphone and feel movement with the motion sensor, and from that they estimate when you slept and how restless you were. Some add snoring recordings or a smart alarm.
They can give a fairly detailed night, but they ask a lot: you have to remember to start the app, the phone has to stay in or next to your bed, and the microphone has to be on all night. A partner or a pet moving the mattress gets counted too. If you’re happy with that routine, it works. Many people give up after a few weeks of forgetting to press start.
4. An app that reads how you use your phone
The newest approach leaves the phone wherever you normally leave it. The app learns when the phone is in use, through Apple’s Screen Time, and combines that with the phone’s own motion data. The last time you put it down at night and the first time you pick it up in the morning, plus whether it was moved in between, mark the edges of your sleep.
There’s nothing to start and nothing to wear, so it keeps working on the nights you’d forget, including day sleep after a night shift. This is how Oyasoo works. The trade-off is honest: it sees your phone, not your body. If you lie awake for an hour without touching the phone, that hour looks like sleep.
What no phone can tell you
Whatever you choose, a phone on its own can’t measure sleep stages (light, deep, REM) the way a sleep lab does with brain activity. Apps that show stages without a wearable are making an educated guess from movement and sound. A phone also can’t see your heart rate or breathing.
What a phone does well is timing: when you fell asleep, when you woke up, how long you slept, and whether that shifts from week to week. For most questions people actually have, like “am I sleeping enough?”, “why am I tired on Mondays?” or “is my phone keeping me up?”, timing is the part that matters.
How to choose
- You want to check something for a week or two: keep a log.
- You want details like snoring and don’t mind a routine: an app with the phone in your bed.
- You want it to run by itself, every night, for months: an app that reads phone use and motion.
The method you’ll still be using in three months beats the one that’s slightly more precise for three weeks. Long-term patterns, like a short night every Sunday or creeping later bedtimes, only show up if the tracking keeps going without you having to think about it.