How Sleep Tracking Work on Smartwatch

Written by Rahul Makwana


While you're sleeping, the smartwatch will use a gyroscope, accelerometer, and even heart rate sensor to finger out your body poster and heart rate, after that, the smartwatch or even fitness Tracker will run all the tests and figure out how many hours you have slept. 

The gyroscope and accelerometer sensors help to track body movements. For example, whether you're sitting, running, hands movement, etc.

Some smartwatches also use the heart rate sensor to monitor heart rate fluctuation. The heart rate is lower when you’re in a deep sleep. In short, by measuring the heart rate data, the watch will give you more accurate sleep data.

Are Smartwatches Reliable? 

This depends on which smartwatch you're using, if you're a cheap smartwatch then there is a chance that you won't get accurate sleep data but if you're using good smartwatches then you will get close to accurate data.

In my testing, the Apple, Fitbit, and Galaxy Watch provide close to accurate sleep data.

Now, this doesn't mean other brands don't provide accurate data. in the end, it all depends on the quality of the sensor used by smartwatch companies.