The science · Sleep

Understand your sleep

Eight hours in bed doesn’t always mean a good night. Bionny tracks your sleep discreetly from your wrist, showing you both its duration and quality.

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Woman sleeping wearing a Bionny band, next to the Bionny sleep duration screen

What the band tracks overnight

Bionny app: sleep trends including efficiency and bedtime

Bionny app: resting heart rate during the night

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Why sleep is worth tracking

A night is made of several cycles of light, deep and REM sleep, usually with a few brief awakenings. Sleep experts recommend that adults sleep 7 hours or more a night on a regular basis ¹, and sleeping enough supports concentration, mood and the health of your heart and metabolism ².

Timing matters too. In a large study of more than 60,000 people, those with the most regular sleep times had markedly better long-term health outcomes than those with the least regular sleep ³. Regularly sleeping too little, or much longer than needed, is also associated with poorer long-term health ⁴.

Get Bionny

Man in bed checking his sleep in the Bionny app

Sleep questions

Do I need to do anything at night?

No. Wear your band snug and it tracks in the background. Open the app in the morning to sync your night.

Does it matter how I wear it?

Yes. The optical sensor needs steady contact with your skin. A loose band can miss part of your night or blur your sleep stages.

Will anything light up while I sleep?

No. Bionny has no screen, so nothing lights up while you sleep.

Why didn’t I get a score last night?

You need at least three hours of recorded sleep for a Sleep Score. Shorter nights are still logged.

How long does the battery last?

Up to 30 days on a full charge, so you never miss a night.

Is it a medical sleep test?

No. Bionny is a wellness device and can’t tell you if you have a sleep disorder. If you’re worried about your sleep, talk to a healthcare professional.

Do I get a Sleep Score from the first night?

Yes, as long as you slept for at least 3 hours. During your first nights, the score is based on sleep duration and efficiency. Regularity is added once Bionny has 3 previous nights to compare with.

Why do my first nights of data seem less precise?

The band needs a few days to calibrate to your wrist and your sleep rhythm. Make sure you’ve removed the thin protective film from the sensor and that the band fits snugly.

Sources

Watson NF et al. (2015). Recommended amount of sleep for a healthy adult: AASM & SRS joint consensus statement. pubmed.ncbi.nlm.nih.gov/25979105
Centers for Disease Control and Prevention (2024). About Sleep. cdc.gov/sleep/about
Windred DP et al. (2024). Sleep regularity is a stronger predictor of mortality risk than sleep duration: a prospective cohort study. Sleep.
Cappuccio FP et al. (2010). Sleep duration and all-cause mortality: a systematic review and meta-analysis of prospective studies. Sleep.

Bionny is a wellness device. It is not a medical device and is not intended to diagnose, treat, cure or prevent any disease.