How a Wearable Reads Heart Rate During Sleep
Wearables measure heart rate during sleep using optical sensors on the skin. Here is what that signal captures and wh...
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What a Sleep Score Actually Calculates
A sleep score is a single number derived from sensor proxies, not a clinical diagnosis — here is what the calculation...
Read itHow Wearables Detect Sleep Stages
Wearables infer sleep stages from heart rate, movement, and skin signals — not brainwaves. Here is what the data show...
Read itWhat Heart Rate Variability Reveals About Sleep
Heart rate variability shifts measurably across sleep stages, and wearable trackers use those shifts to infer sleep d...
Read itHow Accurate Consumer Sleep Trackers Really Are
Consumer sleep trackers estimate sleep stages from motion and heart rate, but their accuracy against clinical polysom...
Read itHow a Sleep Score Is Calculated
A sleep score is a single number derived from wearable sensor data, weighted by proprietary algorithms — not a clinic...
Read itWhat a Polysomnogram Actually Records
A polysomnogram is a clinical sleep study that simultaneously records brain activity, eye movement, muscle tone, and breathing.
Read articleHow a Sleep Tracker Actually Measures Sleep
Consumer sleep trackers infer sleep stages indirectly from motion and heart rate, not from the brain activity clinical tests record.
Read articleAll The Articles
- How a Wearable Reads Heart Rate During Sleep
- What a Sleep Score Actually Calculates
- How Wearables Detect Sleep Stages
- What Heart Rate Variability Reveals About Sleep
- How Accurate Consumer Sleep Trackers Really Are
- How a Sleep Score Is Calculated
- What a Polysomnogram Actually Records
- How a Sleep Tracker Actually Measures Sleep