Sleep Data Missing

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The reason here is that your Watch isnโ€™t sending any heart rate data to the iPhone, or, the app has no permissions to read it. HeartWatch can only report on items where it can see heart rate data. You can check this by going into the Health app, Browse tab and Heart, then into Heart Rate, scroll to bottom and select 'Show All Data'. Select a date where you have missing sleep and go to about 2am when you would normally be asleep and check if it was recording your heart rate. If no heart rate data, then HeartWatch will not be able to show anything.


The points below are the Common Reasons for No Sleep Data, this applies to 90% of requests for missing sleep data as it will stop heart rate data being measured by the Apple Watch:

1. Is bluetooth turned on? Some people accidentally turn it off. Itโ€™s easy to do.

2. Are either of the devices in flight mode?

3. Did the Watch go into low power mode (< 10% battery)?

4. Do you have a passcode on your Watch? This is required for background heart rate data. Important - this catches a lot of users out!

5. In Passcode in the Apple Watch settings app have you turned on Wrist Detection? This is required for background heart rate.

6. In Privacy in the Apple Watch settings app, both Heart Rate & Fitness Tracking need to be turned on.

7. Do you have a prominent wrist tattoo? The ink, pattern and saturation of some tattoos can block light from the sensor, this often prevents the background heart rate sensor from working.

*Note that if no sleeping heart rate data was recorded for a previous night, it will not magically appear in HeartWatch if it does not exist.


Following the above checks, if all are ok then we have a health permissions issue. As strange as this sounds, sometimes even though they show as enabled, iOS updates can play havoc and it is safe to reset the health permissions (yes, we have seen occasions where they show as on but they are really off, so please always reset):

Reset Permissions Steps:

To reset HealthKit permissions and iOS and Watch health services and ensure everything works on the watch going forward, please perform these steps below. It is important to do all steps in this exact order especially Step 2 reboots as this restarts the crashed system services on your iPhone and Watch.

  1. First we want to turn all permissions off. Go into Settings on your iPhone:

  • Select Privacy & Security

  • Scroll down and select Health.

  • Select HeartWatch.

  • Make sure that all the switches are turned OFF.

  1. Power both devices off and back on again, this includes the iPhone and the Watch. i.e. Shut down completely and restart. This is an important step. Instructions showing how to shut down devices:

iPhone: https://support.apple.com/en-au/HT201559

Watch: https://support.apple.com/en-au/HT204510

  1. Next is allowing health permissions by turning them to ON. Go into Settings on your iPhone:

  • Select Privacy & Security

  • Scroll down and select Health.

  • Select HeartWatch.

  • Make sure that all the switches are turned ON.

4. Now go into HeartWatch iPhone app

5. Press the little Settings Cog on the top row (image below)

6. Select Advanced Settings (image below)

7. Select Rebuild History (image below). A red heart will appear and days will start to pre-fill. Note this may take a couple minutes as it loads up 12 months of data.

*Remember that if no sleep heart rate data was recorded for a previous night from a passcode issue for example, it will not magically appear in HeartWatch after rebuilding history.

Updated to iOS16/WatchOS 9 and No Longer Measuring Sleeping SpO2 or Respiration Rate?

Apple have added a new requirement for background measures of SpO2 and Respiration Rate while sleeping called 'Track Sleep with Apple Watch'. This needs to be on the Watch you wear to bed. Steps to check:

  • Open the Apple Watch settings app (you can find it on your iPhone by looking for a black icon with an image of a Watch)

  • Scroll down and tap into Sleep, you will see a switch to enable called 'Track Sleep with Apple Watch'

If still having issues, we recommend reviewing the full setup steps incase another permission has been changed on your iPhone during the iOS update:

Click here for SpO2 setup

Click here for Respiration Rate setup

Use a Dedicated Sleep App

We cannot stress this one enough. You are wearing a Watch to bed to monitor your sleep, so we highly recommend using a dedicated sleep monitoring app that writes to health. If using the Apple Sleep App please be aware of some limitations, we created a page outlining everything here. As a solution there are 2 main options available:

  1. Use HeartWatch sleep tracking, see how to use here.

  2. Download a dedicated sleep tracking app, there are plenty on the market but we of course recommend using AutoSleep, our popular sleep tracking app that like HeartWatch is a one-off low price for life.

Low Power Mode on WatchOS 9

Please be aware that using low power mode on your Apple Watch will turn off background heart measures, heart rate notifications and blood oxygen readings among other things. So it makes sleep tracking of little use as heart rate is the essential health metric. Try avoid low power mode when sleeping. Here is the link to the official Apple site on low power mode and other limitations.

Permissions Video

Here is a Health Permissions video which shows the main steps if a visual helps.


Permissions All Fine But Still No Data

Health permissions all setup but still no data? There are a number of settings to check, refer to this page for information detailing all the steps

The issue should now be resolved. If however you are still having issues, please reply to the original support email so we can assist if you have already logged an issue. If you need to raise a new issue, please contact us via the Support page or directly from within the HeartWatch app (recommended). There is a very good chance we can help you with your Watch problems and get everything working.

If you are new to HeartWatch or just beginning, we recommend reviewing the Quick Start Guide, as it contains all the essential setup and workings of HeartWatch to make sure you have the app setup correctly and perform some basic functions.

The FAQ page contains all the common questions and answers in one place, including the 'Top 10 Most Popular Asked Questions' by all our users.