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WatchPAT Metrics

measurementsWatchPAT measures the following metrics:

  • Real Sleep Time — measures actual time asleep — not just time in bed, like other home devices, providing a more accurate assessment of sleep apnea.
  • RDI and AHI — special indices that determine the severity of sleep apnea.
  • ODI (Oxygen Desaturation Index) — measurement of blood oxygen levels. When not enough oxygen reaches the brain, a person awakens from sleep.
  • Heart Rate — the number of heart beats per minute while sleeping.
  • Body Position — notes whether you sleep on your back (supine), front (prone) or side, which all influence apnea.
  • Snoring Intensity (dB) — loud snoring is a major indicator of sleep apnea.
  • Sleep Stages and Architecture (wake/light/deep) — the cyclical pattern of various NREM and REM sleep stages summarized in a chart called a hypnogram.
  • REM/NREM Sleep — dreaming sleep characterized by rapid eye movement (REM), the shortest portion of the sleep cycle; Non-REM (NREM) sleep, the largest portion of the sleep cycle, has three separate stages and distinct electrical brain wave patterns.
  • Sleep Fragmentation — repeated short interruptions of sleep throughout the night, reducing the total amount of time spent in the deepest level of sleep.
  • Sleep Statistics