Can’t See Sleep Data or Incomplete Data？
If you can’t see your sleep data when you open the app, it might be due to the following reasons:
1. Apple Health Permissions Not Enabled
Somno does not actively track and record your sleep data (such apps typically require your phone to be unlocked and the app running in the foreground while you sleep).
Somno’s sleep data is sourced from Apple Health. Somno requires authorization to access Apple Health. If the user denies reading permissions, Somno will be unable to provide data analysis services. To reauthorize:
- Open the Apple Health app on your iPhone.
- Tap on “Share” in the bottom navigation.
- Find and tap on “Apps”.
- Scroll down, find, and tap on Somno.
- Tap the “Turn On All” button
Tips
We strongly recommend that users Turn On All requested permissions. Somno integrates various data points for comprehensive sleep analysis, and providing only sleep data will limit the depth of analysis results.
All user data will be stored locally and in encrypted iCloud, and we do not have access to users’ private data.
2. Sleep scheduling is not enabled
Please refer to the official guide below to enable sleep scheduling and Watch tracking.
Track your sleep on Apple Watch and use Sleep on iPhone
3. Data Synchronization Incomplete
The watch updates data to Apple Health only after sleep mode ends. Therefore, if you open Somno during sleep mode or immediately after waking, it may display "No Data".
Please open the Apple Health app on your iPhone to check if sleep data is available.
4. Data Source Issues
Starting from version 1.2.0, Somno allows users to manage sleep data sources and choose whether to track InBed data.
To check if the configured data source has recorded sleep data:
- Open the Apple Health app on your iPhone.
- Tap "Summary" and select "Sleep."
- Scroll to the bottom of the page and tap "Show All Data."
If the data source only supports InBed data, go to Somno Settings → Data Source → ensure the "Track InBed as Sleep" option is enabled.
Why Can’t I See the Data for Deep Sleep and Light Sleep Stages？
If you cannot see detailed sleep stage data in Somno, first check if the Apple Health app contains stage data. If it doesn't, the reasons might be:
1. Device or System Requirements Not Met
This feature requires an Apple Watch Series 4 or later, running watchOS 9 or higher.
2. Sleep tracking not enabled on Apple Watch
Please open the Watch app on your iPhone, scroll up on the main page, find the Sleep option, and then turn on "Track Sleep with Apple Watch".
Set up your Sleep Schedule. For details, refer to Apple's official documentation:
Track your sleep on Apple Watch and use Sleep on iPhone
3. Apple Watch Did Not Record Sleep or Data Not Synced
Common reasons include:
- Improper Fit: Wearing the watch too tight or too loose can affect tracking accuracy.
- Communication Issues: Bluetooth is off or the device is in Airplane Mode.
- Low Battery or Power Reserve Mode:
- If the battery runs out during sleep, data may be incomplete or lost.
- Power Reserve Mode disables background heart rate and blood oxygen tracking, preventing detailed sleep stage data.
- Sleep Tracking Lasted Less Than 4 Hours
4. Third-Party Data Sources Do Not Support Sleep Stages
Some third-party sleep tracking apps, like AutoSleep, currently do not support writing sleep stage data to Apple Health.
Therefore, we recommend selecting multiple data sources or ones that support sleep stage tracking.
Why Does the Apple Watch Seem to Update Data Slowly?
Somno automatically loads the latest sleep data every time you open the app. If the data isn't refreshed after multiple attempts, it usually means the Apple Watch has not yet synced data to Apple Health.
To check if the data has been written:
- Open the Apple Health app on your iPhone.
- Tap "Summary" and select "Sleep."
- Scroll to the bottom of the page and tap "Show All Data."
Tips
It's known that if the wake-up alarm is disabled within the sleep schedule, the Apple Watch data sync might be delayed. In such cases, you may need to manually open the Apple Health app to trigger the update.
When is the Sleep Daily Report Sent?
For Apple Watch users, this is usually when the user ends sleep mode. For users of other data sources, it is when data is written to Apple Health.
In other words, Somno will push the sleep daily report after Apple Health updates the sleep data.
Why Is There Inconsistency Between the Data Pushed in the Sleep Daily Report and the Data in the App?
1. Data Source Priority Issues
Somno reads sleep data in the order of Apple Watch > Third-Party Apps > iPhone, with a priority given to analyzing sleep stage data.
Therefore, when there are multiple data sources, for example, if data from source A is written before source B but has a lower priority than source B, inconsistencies may occur.
You can manage the data sources to be displayed in Somno under Settings → Sleep Data Source.
2. Third-Party Data Modification Issues
A few third-party data sources may modify data after it has been initially written, which can also lead to inconsistencies.
Why Is There No Environmental Noise Data?
1. Device or System Requirements Not Met
This feature requires an Apple Watch Series 4 or later, running watchOS 6 or higher.
2. No Environmental Audio Permission
Go to Somno → Settings → Apple Health to check the data authorization status. If the status is gray, it means data authorization is turned off or there is no data.
You can reauthorize according to the Apple Health Authorization Steps. If authorization is granted, check whether environmental sound detection is enabled on the Apple Watch.
3. Environmental Audio Detection Not Enabled
On your iPhone, go to the Apple Watch App, tap My Watch, then tap Noise, and turn on Environmental Audio.
Why Is There No Stress Resilience Data?
1. Device or System Requirements Not Met
This feature requires an Apple Watch Series 4 or later, running watchOS 8.3 or higher.
2. No HRV Permission
Go to Somno → Settings → Apple Health to check the data authorization status. Both Heart Rate and Beat-to-Beat Measurements need to be enabled. If the status is gray, it means data authorization is turned off or there is no data.
You can reauthorize according to the Apple Health Authorization Steps. If authorization is granted, check whether environmental sound detection is enabled.
3. Not Enough Data
Stress recovery is based on your personal HRV (Heart Rate Variability) history from the past 30 days, generating a personalized analysis through algorithms. Therefore, if there is insufficient data, the analysis data cannot be generated.
Please wear your watch daily to help Somno understand you better.
Why Is There No Data for Naps or Other Daytime Sleep？
On iOS 17 and earlier versions, Apple Health only records sleep during the set Sleep Schedule period and a short time before and after. It doesn't track daytime sleep, such as naps or afternoon rest. As a result, we're unable to access and display this data.
The latest iOS 18 and watchOS 11 now support daytime nap tracking. We'll be adapting and supporting this feature in future updates. Stay tuned!
Why Wasn’t My Sleep-In This Morning Tracked？
It might be because Sleep Mode ended when you turned off the alarm.
If you notice that your morning sleep data doesn't include some of your "sleep-in" time, it's likely because Sleep Mode ended and data collection stopped when you turned off the alarm. After the alarm is dismissed, Apple Watch no longer records subsequent sleep.
If you want your extra sleep time to be included in the statistics, we recommend choosing "Snooze" instead of turning off the alarm completely.
Why Is There No Sleep Data for the Weekend？
It's likely because you've only set up a Sleep Schedule for weekdays, but not for weekends.
We recommend enabling the Sleep Schedule for weekends as well, with bedtime and wake-up times that don't differ by more than 30 minutes from your weekday schedule. Maintaining a consistent sleep routine is a crucial factor in improving sleep quality!
For guidance on setting up your Sleep Schedule, please refer to the official Apple documentation.
Set up a Sleep Focus schedule in Health on iPhone
Why Is the Sleep Data Different from What’s Shown in Apple Health？
- The data in Apple Health is influenced by other data sources and priority settings.
- For users on iOS 18, the current lack of support for naps in Somno may also lead to data inconsistencies; we will adapt this in future updates.
- Somno filters out short wake data for the following reasons:
- Very short wake times (micro-awakenings) are often unnoticed by users and do not affect the overall sleep experience.
- Sleep stages themselves have an interleaved nature; brief awakenings can make sleep stages appear too fragmented. Categorizing these short awakenings as part of core sleep or REM sleep aligns better with users' actual sleep experiences.
- Minute-level differences due to data processing accuracy are considered normal.
How Somno Works？
Somno does not track and record users' sleep data directly. Instead, it connects to Apple HealthKit to obtain sleep data recorded and compiled by the Apple Watch. To experience a comprehensive data analysis, you need to wear your Apple Watch while sleeping.
The Apple Watch uses various sensors to detect physiological indicators during sleep, integrating this data and utilizing machine learning and sophisticated algorithms to infer and distinguish different sleep stages. While the data may not be as precise as laboratory EEG instruments, it still offers significant reference value for home use.
The physiological data monitored by Apple includes, but is not limited to:
The accelerometer in the Apple Watch detects body movements and changes in posture. By monitoring nighttime body activity levels, the device can distinguish between wakefulness, tossing and turning, light sleep, and deep sleep. For instance, body activity is typically low during deep sleep and higher during light sleep and wakefulness.
The Apple Watch continuously monitors heart rate using its built-in optical heart rate sensor. Different sleep stages are usually accompanied by distinct heart rate changes. For example, heart rate typically drops to its lowest during deep sleep and may fluctuate during REM sleep.
HRV refers to the variation in the time interval between heartbeats, which is an important measure of autonomic nervous system activity. HRV shows different patterns across sleep stages, being higher during deep sleep and lower during wakefulness and light sleep.
The Apple Watch can indirectly estimate users' respiration rates through heart rate and accelerometer data. Respiration rates vary across different sleep stages, providing additional data to help distinguish between these stages.
Some Apple Watch models (such as the Series 6 and later) include a feature for measuring blood oxygen saturation. While not a direct indicator for distinguishing sleep stages, blood oxygen saturation provides additional health information, contributing to a comprehensive assessment of sleep quality.
Is the Sleep Data from Somno Accurate？
Info
Somno's sleep data is primarily sourced from Apple HealthKit, collected and compiled by the Apple Watch worn by users during sleep.
Somno visualizes this data and, based on literature from institutions such as the American Sleep Foundation, analyzes users' sleep patterns and offers improvement suggestions.
Both Apple Watch and other wearable devices measure heart rate using photoplethysmography (PPG) and combine various data indicators such as acceleration for comprehensive analysis and estimation. The accuracy of this data is approximately 80%. Although the final data may not be as precise as laboratory EEG instruments, it still holds considerable reference value for home use.