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Light, deep and REM, estimated and checked against a home EEG test

Compared block by block against a home EEG test
OPTICALMOTION

Agreement

62%

Four-Stage Sleep Agreement

against a single-channel EEG home sleep test, on all four stages (23 nights, Ring AIR)

Reference standard

FDA-cleared home sleep test (EEG)

Sample size

Based on 23 paired nights

Checked block by block against a single-channel EEG home sleep test across 23 nights, the Ultrahuman Ring’s stage estimates agreed with it about 62% of the time.

0%20%40%60%80%100%62%Ultrahuman Ringvs a home EEG test83%Trained human scorersvs the consensusfour-stage agreement (%)
62%all four estimated stages, against a home EEG test
83%where trained scorers agree with the consensus
4stages scored
Figure 1 — All four estimated stages, from awake through light, deep and REM, compared block by block.

Staging is a judgement made from brain activity, and no wearable has access to that. The Ultrahuman Ring works the stages out from your heart rate, your movement and your temperature instead, reading the body’s downstream signature of what the brain is doing rather than the brain itself.

The number that gives this one its meaning is the second bar. Across more than 2,500 trained scorers reading the same records, agreement with the consensus score runs at about 83% of a night. Staging is not a task with one right answer, so the human ceiling is the one to measure a device against.

Sleep timing, meaning when you fell asleep, when you woke and how long you slept, is measured a great deal more tightly, and it is the part of sleep tracking most people actually act on.