Sleep Tracking with BKWAT
Sleep is where a wearable earns its place: you wear it for the whole night, and in the morning you can see how long you slept, how restful it was and how your body recovered. Here is what BKWAT devices track overnight and which one suits you.
What BKWAT tracks while you sleep
- Sleep time: when you fell asleep, when you woke up and how long you slept.
- Sleep stages: light, deep and REM sleep and time awake (on supported models).
- Sleep score: a single nightly score that sums up your sleep (on supported models, such as the BKC1 and BKD1 rings).
- Overnight heart rate and HRV: how your heart rate and heart rate variability change through the night.
- Blood oxygen (SpO₂): overnight blood oxygen trends on most models.
Ring, band or watch?
| Best for | Good to know | |
|---|---|---|
| Smart ring | People who want the most comfortable option for sleep | Small and light, nothing on your wrist. No screen on most models, so you check your data in the app. |
| Screenless band | People who want a light band with no screen lighting up at night | A soft fabric strap and no display to disturb you. |
| Smartwatch | People who also want calls, notifications and sports modes during the day | Bigger on the wrist at night, but one device for everything. |
Our picks for sleep tracking
Smart rings
- BKC1 Ceramic Smart Ring: sleep duration, sleep score and sleep stages, plus HRV and blood oxygen.
- BKD1 Jewelry-Inspired Smart Ring: sleep stages including REM and a nightly sleep score, with about 10 days per charge.
- V80 Titanium Smart Ring: overnight sleep analysis from midnight to 6am, updated every five minutes, plus HRV.
- K80 Smart Ring: sleep, HRV, blood oxygen and temperature, with a small display on the ring.
- BKP2 Smart Ring: our most affordable ring, with sleep tracking and 5–7 days per charge.
Screenless bands
- TK35 Pro and TK36: sleep, HRV, blood oxygen and temperature, plus ECG.
- S01 and HK50: sleep, HRV and blood oxygen in a simple band.
Smartwatch
- Health Smartwatch 3: sleep, blood oxygen and temperature, plus ECG.
Compare all rings side by side on our smart ring comparison page.
Tips for better sleep data
- Wear your device every night. Patterns over a week tell you more than a single night.
- Wear it snug: a ring or band that slides around gives weaker readings.
- Charge in the morning or evening, so the battery lasts through the night.
- Pick the right ring size. See our ring size guide.
Read more about sleep
- How smart rings track sleep
- Sleep tracking with a smartwatch
- The truth about smartwatches and sleep
- How lack of sleep affects your heart rate
BKWAT devices are wellness products, not medical devices. They are not intended to diagnose sleep disorders or any other condition. If you are worried about your sleep, talk to a doctor.