Circadian Cycle Tracking

Sleep is one of the most sought-after features in wearables but current devices fall short when it comes to measuring true recovery, sleep quality, or circadian adaptation. Most rely on indirect indicators like heart rate variability or motion, offering only surface-level insights.

greenteg’s CALERA® technology changes that.
Our medically accurate, continuous core body temperature (CBT) sensor provides a powerful, science-backed marker for sleep regulation, circadian rhythm tracking, and recovery monitoring. By integrating CALERA, wearables can go beyond sleep stage estimates to deliver meaningful insights into jetlag, shift work adaptation, and restorative sleep quality.

Used by leading research institutions worldwide, CALERA enables a new level of physiological understanding—helping you bring next-gen sleep insights to your customers.