People want to record their sleep for very human reasons: to settle whether they snore, to catch the sleep talking a partner keeps laughing about, or to check on a gasp or cough that's been worrying them. The good news is your smartphone is a genuinely capable tool for this — the microphone in a modern phone is sensitive enough to pick up the sounds that matter.
The basics, done well
- Placement. On the nightstand, within about a metre of your head, mic unobstructed (not face-down, not under a pillow). Close enough to hear breathing, not so close you knock it off.
- Power. A full night of audio is many hours — keep the phone charging so it doesn't die at 2 a.m.
- Do not disturb. Silence notifications so you don't record (or get woken by) pings.
- Quiet the room. A loud fan or open window can mask the very sounds you're trying to hear.
The real problem: eight hours is a lot to listen to
Anyone who's tried this with a plain voice recorder hits the same wall. You wake up to a seven-hour file and no realistic way to review it. Ninety percent is silence and rustling; the interesting ten seconds are buried somewhere you'll never find by scrubbing. Raw recording is easy — finding the signal is the hard part.
What to actually do with the audio
Once you can find the events, look for patterns rather than single clips:
- Snoring: how much of the night, how loud, and whether it clusters on your back or after alcohol. See how to know if you snore.
- Sleep talking: when in the night it falls, and whether busy or stressful days line up with noisier nights.
- Gasping or choking: whether it's preceded by snoring — the detail that matters most if you're taking it to a doctor.
What recording can and can't tell you
Audio is great for sounds: snoring, talking, coughing, the rhythm of breathing. It can't measure blood oxygen, and it can't diagnose sleep apnea — only a medical sleep study can do that. Treat what you capture as evidence to notice patterns and to bring to a professional, not as a verdict.
Where SleepTrace fits
This is exactly the problem SleepTrace was built to solve. It records the night on your iPhone, then does the tedious part for you — detecting the sounds, tagging what they are, and laying them over your sleep stages so the interesting ten seconds surface automatically. You wake up to a readable map of the night instead of a seven-hour file. No wearable, no extra hardware. Try it tonight →
SleepTrace is a wellness app, not a medical device. This article is general information, not medical advice. If your symptoms are frequent, severe or worrying, please talk to a doctor.
Hear your own night. SleepTrace turns a night of audio into your sleep phases, the sounds you made, and how it all trends — no wearable, just the iPhone on your nightstand. Download on the App Store →