The sleep data on my wearable is inaccurate
Update your wearable and the Huawei Health app to the latest versions.
If the issue persists, perform the following operations.
Missing sleeping data
- The wearable records your sleep data based on your wrist movements when you are asleep. If your wrist moves a lot when you are asleep, the wearable may not be able to detect that you were sleeping and will not record this as sleep data in this instance. To prevent inaccurate readings, try wearing the device on your non-dominant hand while sleeping (on your left hand if you are right-handed, and vice versa).
- If you are asleep for less than 30 minutes, your wearable may not be able to detect that you were sleeping, and will not record this as sleep data in this instance.
- When you are traveling and fall asleep on transport such as the metro, bus, or train, the movement or increase in speed of the transport you are taking may result in sleep data not being recorded.
- Sleep monitoring may be abnormal if the device is too loose when you are wearing it. Make sure that you keep your wearable facing upward, and wear it further down the wrist. To prevent inaccurate sleep data from being recorded, avoid wearing the device too tightly or loosely.
- If this issue persists, bring your device and proof of purchase to a nearby Huawei Customer Service Center for assistance.
Multiple sleep data records
When you are wearing the device:
- If you are wearing the device in a relatively quiet scenario and have a motion range similar to that of when you are sleeping, such as when you lie down to watch TV, read a book, or do meditation, the device may mistakenly determine that you are sleeping. Place the wearable on its side or back up on a flat surface if you are not going to use it for a short period of time. Power off your band/watch if you do not plan on using it for an extended period of time.
- If you have not been working out regularly or have not performed any operations on the device screen for an extended period of time after waking up, this may cause your device to remain in Sleep mode.
When you are not wearing the device:
- Your device determines whether it is being worn through a built-in PPG sensor, which reflects light off your skin. Therefore, when the sensor of your wearable is placed facing downward (such as when placed on a desk, wash basin, sofa, or quilt), the light received by the wearable is similar to that received by your wrist, and the wearable will misidentify that it is being worn and start sleep monitoring. As a result, the sleep data and duration are different from the actual situation.
- If the bottom of your wearable is blocked by an object or shakes slightly, your wearable may start sleep monitoring and record sleep data.
Inaccurate wakeup times
- More than actual wakeup times: If you unconsciously turn from side to side while asleep, the device may misidentify that you are awake.
- Less than actual wakeup times: If there is minimal movement after waking up, the wearable may remain in Sleep mode and fail to record actual wakeup times.
The proportion of sleep states changes
- HUAWEI TruSleep™ data is analyzed based on the entire sleep data and is not accumulated in segments. After you wake up and fall asleep again or do not move much, the newly generated sleep data will be combined with the previous data as a whole to recalculate deep, light, and REM sleep data. As the total sleep duration changes, the proportions of deep, light, and REM sleep will also be recalculated.
- It will take a while for the data to be updated after you are no longer sleeping. We recommend that you view the data after being awake for one hour to get more accurate sleep data.
Note: The figure on the left shows the data viewed at 6:32, and the figure on the right shows the data viewed at 7:21 after you fall asleep again.
The sleep time is shorter than the actual time
Generally, the sleep duration data is related to the time you fall asleep, wake up, and are awake. If the sleep data displayed on your wearable is different from your actual sleep data, it may be because the wearable determines the time you fall asleep, wake up, and are awake based on the acceleration signals and heart rate signals. If you are in an unsettled state before going to bed, if you frequently turn around after waking up in the morning, or if you are awake and frequently turn from side to side at night, the time you fall asleep, wake up, and are awake determined by your wearable is different from what you believed it to be. Due to the algorithm's monitoring capabilities and limitations, the total sleep duration determined by your wearable may differ from what you believed the total sleep duration to be. If the difference is within a certain range (about 30 minutes), this is normal and does not indicate a problem with your device.
The proportions of sleep states are different on different wearables
Due to the different hardware specifications of devices, the data collected by sensors throughout the night may be different. As a result, the duration and proportion of different sleep states may differ. This is normal and does not indicate a problem.
1. The sleep monitoring algorithm of the WATCH 3 series is linked to Huawei phones running EMUI 11.1 or later to improve the sleep monitoring accuracy. When your wearable is connected to your phone and detects that your phone is still in use when you fall asleep, it will record the sleep data as not sleeping or being awake. Therefore, do not let other people use your phone when you are sleeping.
2. If the sleep data on your wearable cannot be synced to the Health app, refer to The Huawei Health app cannot correctly display my sleep data or sync my sleep data from the wearable.