How does the Apple Watch sleep tracking technology measure deep sleep versus rem sleep without breaking the bank on medical devices?
Download run
Fan-out diagram
The searches the AI actually ran for this prompt.
SEED QUERY
How does the Apple Watch sleep tracking technology measure deep sleep versus rem sleep without breaking the bank on medical devices?
1 real search · 1 real-search pass
Apple Watch sleep stage tracking accelerometer heart rate HRV algorithm validation polysomnography deep REM accuracyGoogle ↗
OBSERVEDReason
Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.
Query classes
Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.
ChatGPT real searches (1)
Classes come from the query-classifier (a local Laya model). 1 of 1 calls are low-confidence (under 50%) — hover a query in the table to see its confidence.
Searches and sources
ChatGPT1 real searches · gpt-6
Apple Watch sleep stage tracking accelerometer heart rate HRV algorithm validation polysomnography deep REM accuracy Google ↗
- Accuracy of Three Commercial Wearable Devices for Sleep Tracking in Healthy Adults · pubmed.ncbi.nlm.nih.gov
- Accuracy of Three Commercial Wearable Devices for Sleep Tracking in Healthy Adults · pmc.ncbi.nlm.nih.gov
- Estimating Sleep Stages from Apple Watch · apple.com
- Estimating Sleep Stages from Apple Watch · apple.com