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Light, deep and REM, scored against brain activity

Scored block by block against a brain-activity reference
OPTICALMOTION

Accuracy

62%

Four-Stage Sleep Agreement

against a brain-activity reference, on all four stages

Reference standard

FDA-cleared home sleep test (EEG)

Sample size

Based on 23 paired nights

Scored block by block against a brain-activity reference, the Ultrahuman Ring agrees on all four sleep stages 62% of the time.

0%20%40%60%80%100%62%Ultrahuman Ringvs brain activity83%Trained human scorersvs the consensusfour-stage agreement (%)
62%all four stages, against brain activity
83%where trained scorers agree with the consensus
4stages scored
Figure 1 — All four stages, from awake through light, deep and REM, scored 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.