My WHOOP device disconnects during the night, and when I wake up, I have to reconnect it. Then it asks me to end my sleep and shows me the data. Last night it displayed a stress monitor indicating I was in medium stress almost all night I know it’s not true , even though I actually slept very well. It also showed that my HRV was extremely low, which significantly reduced my recovery score.
How can the device be disconnected all night and still show data? How do I know if the data is accurate? It doesn’t seem right — usually, I get around 7 hours of low-stress sleep, but on nights when the device disconnects, it suddenly shows high stress. This really affects my trust in the device. What can be done about this issue?
Sorry to hear you are experiencing trouble with connectivity. Here’s some helpful information about this issue:
WHOOP can store up to 14 days of data locally on the device, so even if it disconnects from your phone overnight, it will sync the stored data once reconnected. This is why you still see data after reconnecting.
However, if the device disconnects during sleep, it may miss some heart rate signals or have gaps in data. Missing or inconsistent heart rate data can affect the accuracy of sleep stages, stress monitoring, HRV, and recovery scores.
WHOOP calculates sleep and stress metrics based on continuous heart rate variability (HRV), respiratory rate, and movement data. For the most accurate readings, the device needs a snug fit about one finger-width above your wrist bone, with stable skin contact throughout the night.
If the strap is loose, improperly positioned, or removed during sleep, it can cause data gaps or inaccuracies, which may explain why you see higher stress or lower HRV on nights with disconnection.
External factors like sleep interruptions, environmental conditions, or activities in bed can also influence heart rate and stress readings.
WHOOP recalibrates sleep baselines every few weeks to maintain accuracy, so monitoring your sleep data over several nights can help identify patterns or persistent issues.
To improve accuracy and reduce disconnections, please try these steps:
Ensure your WHOOP strap is snug and positioned correctly on your wrist.
Keep your phone and WHOOP device close during sleep to maintain Bluetooth connection.
Avoid force closing the WHOOP app or enabling battery optimization settings that restrict background activity.
Make sure your WHOOP app and device firmware are up to date.
If you continue to experience frequent disconnections or suspect inaccurate data despite these steps, please reach out to support@whoop.com so they can investigate if there is an issue with the device itself.