My sleep analysis is incorrect after recording a session using the Apple Watch.

If your sleep analysis produces large amounts of awake, deep sleep, REM or in general appears inconsistent with what you would expect, please check the following:

Identifying the cause of the issue

Read below for more information

Ensure that your Apple Watch records data in Apple Health for Heart Rate and Active Energy:

Pillow v.3.5 introduced a new sleep analysis algorithm on the Apple Watch that requires access to the following Apple Health metrics: Heart Rate, Active Energy, Steps and Stand Hours. If Pillow does not find data or does not have permission to access data for those metrics, then sleep analysis will not work properly.

Heart Rate

  1. Open the Apple Health on your iPhone
  2. Tap on the “Health Data” tab
  3. Select “Vitals”
  4. Select “Heart Rate”
  5. Select “Show all data“
  6. Select the day that you recorded the session
  7. In the values listed, there must be records made by the Apple Watch during the time you were asleep every 3-10 minutes.

Active energy

  1. Open the Apple Health on your iPhone
  2. Tap on the “Health Data” tab
  3. Select “Activity”
  4. Select “Active Energy”
  5. Select “Show all data“
  6. Select the day that you recorded the session
  7. In the values listed, there must records made by the Apple Watch for the duration of your sleep session.

If you don’t find any records then your Apple Watch might be defective or you don’t have enabled the required features.

Read below for ways to resolve this:

Check that Pillow has all the necessary permissions

If Pillow does not have the required permissions, it will not be able to access the data necessary for sleep analysis.

To check the permissions:

  1. Open Pillow on your iPhone
  2. Tap on the Settings icon on the bottom left corner
  3. Select “Setup permissions”
  4. Ensure all permissions have a green checkmark

Reset Apple Health Permissions

If all permissions had already been turned on and the problem persists we recommend that you reset your Apple Health permissions.

To reset your Apple Health permissions follow these steps in that particular order:

  1. Open the Apple Health app on your iPhone
  2. Tap on the “Sources” tab
  3. Select “Pillow”
  4. Select "Turn All Categories OFF"
  5. Restart your iPhone
  6. Restart your Apple Watch
  7. Open the Apple Health app
  8. Tap on the “Sources” tab
  9. Select Pillow
  10. Select "Turn All Categories ON”

Additional things to check:

Enable Wrist detection

If you have turned off wrist detection, heart rate data will not be recorded by your Apple Watch which is necessary to perform sleep analysis

To enable wrist detection:

  1. Open the “Watch” app on your iPhone
  2. Go to “Passcode”
  3. Turn ON “Wrist Detection”

Passcode

If you use a passcode for your Apple Watch, your sensor data will not be accessible if do not enter a passcode when you go to sleep.

When you wear your Apple Watch when you go to sleep, remember to enter your passcode.

Ensure that Fitness tracking is turned on.

  1. Open the “Settings” app on your iPhone
  2. Go to “Privacy” > “Motion & Fitness”
  3. Turn ON “Fitness Tracking”
  4. Turn ON the switch next to Pillow

The position of the Apple Watch & Tattoos

If you wear your Apple Watch loosely on your wrist the Heart Rate Sensor on your wrist will not be able to record your heart rate properly.

If you have a large tattoo on the wrist that you wear your Apple Watch then your heart rate data might not be recorded properly.

Ensure that you Start a session that uses the Apple Watch

The easiest way to start a session using your Apple Watch is as follows:

  1. Open Pillow on your iPhone
  2. Set the desired alarm time.
  3. Leave the app open (do not press the home or side buttons)
  4. Open Pillow on your Apple Watch
  5. Tap on “Start”
  6. Select the desired recording mode
  7. Tap on “Next” at the bottom of the screen

Unpair and pair your Apple Watch

If none of the above works we suggest that you un-pair and pair your Apple Watch again. We strongly recommend that setup as a new Apple Watch since restoring from a backup might bring back the problematic setup that is causing this issue

Pillow A.I. training

Pillow’s new sleep analysis algorithm will train and adapt over time. Getting unexpected results for the first few nights might be due to the fact that Pillow’s algorithm is still in training mode.

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