Clarity about what a tool does — and what it doesn't do — matters. This is especially true for anything related to health or sleep, where the gap between "tracks a pattern" and "diagnoses a condition" is significant. This article is a plain-language explanation of exactly where NightPosture sits.
What NightPosture does
NightPosture uses the motion sensors in an iPhone to estimate sleep-position patterns during an active session. At the end of the night, it shows a simple summary: how you appeared to spend time in different positions, and any notable shifts during the session.
You can add a brief note about how the night felt. Over multiple nights, this creates a personal record of patterns — not a medical measurement, but a consistent signal you can look back on.
The app is designed to support personal experimentation: try one change, observe for a week, and see whether anything looks or feels different. That's the loop NightPosture is built around.
What NightPosture does not do
NightPosture does not diagnose any medical condition. It cannot tell you whether you have obstructive sleep apnea, a sleep disorder, or any other health issue. An estimated position pattern from a phone's motion sensor is not a clinical measurement.
It does not replace a sleep study (polysomnography). A clinical sleep study measures dozens of signals simultaneously — brain activity, eye movement, oxygen levels, heart rate, breathing effort, leg movement — and is interpreted by trained sleep specialists. NightPosture measures none of these things.
It does not provide health outcome predictions. NightPosture will not tell you whether your sleep position is affecting your health, whether a change you made is medically beneficial, or what position you "should" be sleeping in.
It does not replace professional medical advice. If you have concerns about your sleep — daytime sleepiness that affects your functioning, witnessed apneas, loud snoring, or anything else that worries you — the right resource is a qualified healthcare provider, not a wellness app.
Why we're clear about this
There are many apps in the sleep space that make claims that exceed what the underlying technology can support. We don't think that's helpful, and we don't want NightPosture to contribute to confusion about the difference between consumer wellness tools and medical-grade devices.
Being honest about scope also makes the app more useful. If you know what NightPosture actually measures, you can use it appropriately — as a personal observation tool, not as a replacement for professional evaluation.
Who the app is for
NightPosture is for curious people who want to notice their sleep-position patterns, explore whether small habit changes feel different over time, and build a clearer personal picture of their nights. It's a wellness tool for self-aware experimenters, not a medical device.
If that sounds like you, the beta is a good place to start. If you're looking for a clinical sleep assessment, please speak with a doctor or sleep specialist.