For people
The band is the same in every case. What changes is what you ask of it — and every one of these is a different product decision underneath, with its own claims, its own limits and its own reasons to be careful.
Staged from the brain, not guessed from your pulse
Your real best hours, and what the room costs you
Central fatigue, readiness and overreaching
Drowsiness, with warning before you know
Whether the session actually worked
Attention measured, and the classroom with it
A long, quiet record to take to a doctor
The one patient who cannot tell you anything
One platform
The single most useful sentence this product can say is “here is how last night showed up in today.”
Saying it requires both halves — the night and the day — which is why a sleep tracker and a focus tracker are not really two products. Add the room sensor and you get the third piece: not just what happened, but what you could change.