1. Wear the Watch Properly

The most common way to fix the sleep detection issues on Galaxy Watch 4 is to wear it properly. Many people wear the watch loose while sleeping for comfort which may prevent the sensors to keep in touch with your wrist’s skin.

You should wear the watch firmly- not too loose and not too tight. It should sit on your wrist so that the sensors stay in contact with the skin. Also, you should wear the watch slightly above the wrist bone. This will help the watch detect your sleep easily and accurately.

2. Enable Blood Oxygen Monitoring During Sleep

When blood oxygen monitoring is enabled, the watch can detect your sleep more accurately by measuring the oxygen-containing cells moving in your body. This is because the movement of these cells gets slow during sleep as our body relaxes.

You should enable the Blood oxygen during sleep feature on your Galaxy Watch 4 so that it can track your sleep levels correctly. Here’s how to enable it:

1. Swipe up on watch’s home screen, and click on the Settings icon.
2. In settings, select the Samsung Health option.
3. Scroll down and enable Blood oxygen during sleep.

3. Update Galaxy Watch 4 to the Latest Version

If your watch is not tracking sleep data or showing incorrect data, check if an update is available. Samsung has pushed quite a few updates since the release. Here’s how to update the Galaxy Watch 4 to the latest version:

1. Swipe up on the watch’s home screen, and go to Settings.
2. Scroll down to the last and select Software update.
3. It will check for updates, if available then it will show to install the update. Otherwise, it will show the watch is up to date.

4. Factory Reset the Watch

If your Galaxy Watch 4 is still not able to track your sleep or shows incorrect data, then you should try performing a factory reset. Doing so may clear concurrent bugs or issues in the watch’s software.