SomniSync uses your phone's microphone and motion sensors to track your sleep — no wearable required.
Getting Started
Set up your profile
Go to Settings and enter your name and age range. This helps personalise your sleep score.
Set a sleep goal
In Settings, choose how many hours of sleep you're aiming for each night. The default is 8 hours.
Allow permissions
SomniSync needs microphone access to detect snoring and breathing, and motion access to detect movement. You'll be prompted the first time you start a session.
Connect Apple Health (optional)
On iPhone, SomniSync can read your heart rate from Apple Health to improve sleep stage accuracy. You'll see a permission prompt when you start your first session.
Starting a Sleep Session
Before you sleep
Open the Sleep tab
Tap Sleep in the bottom nav, or tap "Start Sleep Session" on your Dashboard.
Set your smart alarm (optional)
Enter your wake-up time and choose a wake window (15–60 min). SomniSync will wake you at the lightest moment within that window.
Place your phone
Set your phone face-down on your nightstand or mattress near your pillow — within about 1 metre. The mic needs to detect your breathing.
Tap Start Session
The screen stays on and begins tracking automatically. SomniSync holds a wake lock so your phone doesn't sleep.
SomniSync works best in a quiet room. Loud fans, TV, or traffic can affect accuracy.
Understanding Sleep Stages
SomniSync estimates your sleep stage every 30 seconds using motion, audio, breathing rate, and (on iPhone) heart rate from Apple Health.
You're moving or your breathing/heart rate indicates wakefulness. Brief awake periods are normal.
The transition stage in and out of deeper sleep. Easy to wake from. Makes up the largest portion of a healthy night.
Rapid eye movement sleep — where dreaming happens. Vital for memory and emotional processing. Usually begins 45–90 min after falling asleep.
Slow-wave sleep. The most restorative stage — grows tissue, boosts immunity, consolidates memory. Concentrated in the first half of the night.
Estimated from phone sensors — not a medical measurement. Results may differ from clinical studies or wearables.
Reading the Sleep Skyline
Your night as a skyline
After a session, your night is displayed as bars growing upward — taller bars mean deeper sleep, left to right across the night.
■ Tall blue columns = Deep sleep
■ Medium amber blocks = REM
■ Short teal bars = Light sleep
■ Tiny pink blips = Brief awakenings
A healthy night shows repeating cycles of light → deep → REM, roughly every 90 minutes.
Smart Alarm
The smart alarm watches your sleep stage in the minutes before your set wake time. When it detects you're in light sleep or REM within your wake window, it triggers — making waking feel gentler.
If you never reach a light stage within the window, it triggers at your exact set time.
Tip: A 30-minute window gives the best chance of a light-sleep wake.
Logging Your Sleep
After a session ends you'll be taken to the Log automatically. You can also log sleep manually any time by tapping the Log tab.
What to log
• Bedtime and wake time
• Sleep quality (1–5 stars)
• How you felt on waking
• Sleep disruptors (stress, caffeine, alcohol, etc.)
• Notes
Insights
The Insights tab analyses your recent logs to surface patterns — weekly trends, average duration, sleep score trajectory, and which disruptors most affect your deep sleep.
Log at least 5 nights for meaningful patterns to appear.
Apple Health & Heart Rate
On iPhone, SomniSync reads your heart rate from Apple Health after each session. If you wear an Apple Watch or paired HR monitor while sleeping, this data is automatically available — just tap Allow when prompted.
Heart rate significantly improves deep sleep and REM detection. It is never sent off your device.
Exporting Your Data
Go to Settings → Export sleep data to download a CSV file with all your nights — duration, quality, score, stage percentages, snore clips, and average breathing rate. Share it with your doctor or open it in Excel or Google Sheets.
Common Questions
Why does my deep sleep % look high or low?
Phone-based tracking estimates stages from limited signals — especially without heart rate data. Connect Apple Health for better results. These are estimates, not clinical readings.
Does SomniSync work without internet?
Yes. All tracking, logging, and insights happen on your device. An internet connection is only needed when the app first loads.
Does the app record audio of me sleeping?
Only short clips when a snore event is detected. Nothing is sent to any server. You can review and delete clips in the Sleep tab.
My smart alarm didn't go off — why?
Keep the app open and in the foreground on iOS. SomniSync requests a wake lock automatically but the app must stay active. Double-check your alarm time and wake window.
Can I use SomniSync without placing it near my pillow?
You can, but accuracy drops. The mic needs to be within about 1 metre to reliably detect breathing. The motion sensor works at any distance on the same surface you're sleeping on.