Sleep & Circadian
What the Ring reads overnight, and how a night becomes a score.
11 guides
Sleep Index explained: how the Ring scores your night
Ultrahuman Caffeine Window and timing explained
Circadian Alignment PowerPlug explained
How the Ultrahuman Ring measures Restorative Sleep
How Ultrahuman measures skin temperature overnight
How Ultrahuman measures sleep consistency
How Ultrahuman measures sleep duration (total sleep time)
Sleep stages: How the Ultrahuman Ring measures Light, Deep, REM, and Awake
Social jetlag explained
Time in Bed vs Time Asleep explained
