Table 3.
Mapping sleep parameters measured by consumer sleep trackers to clinical terminology
| Clinical terminology | Fitbit | Neuroon |
|---|---|---|
| Total sleep time (TST) | Minutes asleep | Sleep duration − time awake |
| Wake after sleep onset (WASO) | Minutes awake | Time awake |
| Stage N1 + N2 (light sleep) | Light | Light ratio × sleep duration |
| Stage N3 (deep sleep) | Deep | Deep ratio × sleep duration |
| REM sleep | REM | REM ratio × sleep duration |
| Number of awakenings (NAWK) | Number of awakenings + number of restlessness | Number of awakenings |
| Sleep onset latency (SOL) | Time to fall asleep | Time to fall asleep |
| Sleep efficiency (SE) | Sleep efficiency | 1 − |