THE SCIENCE
No horoscopes. Real chronobiology.
Kairo runs on the same models sleep researchers use — chronotype, the two-process model of sleep regulation, and the light phase-response curve.
Your sharpest focus comes a few hours after waking
For most people, analytic, high-attention work lands best in the late morning. Kairo estimates your cognitive peak and points your deep work at it.
Strength peaks in the late afternoon
Power and strength tend to peak when core body temperature is highest, in the late afternoon. Kairo times training toward that window.
Insight likes your off-peak hour
Counterintuitively, creative and insight problems are often solved better at your non-optimal hours — so Kairo schedules creative work differently from analytic work.
Light is your clock's strongest cue
Light is the dominant signal that sets your body clock. Kairo accounts for your daylight and shows when morning light helps nudge your rhythm.
Social jet lag is real
The gap between your body clock and your social schedule is linked to how you feel and perform. Kairo helps you see it and shrink it.
Honest estimates, not fake precision
Kairo estimates your circadian phase from behaviour and wearable signals and shows windows, not fake-precise minutes. The more nights it sees, the more it's your clock and less the average one.
What Kairo does not claim
Kairo does not measure your melatonin or diagnose anything. It does not promise a fixed productivity boost. It estimates timing and helps you act on it — the science is about when different work fits your physiology, not a cure.
References
- Roenneberg et al. — Munich ChronoType Questionnaire (MCTQ), chronotype & social jetlag.
- Borbély (1982); Daan, Beersma & Borbély (1984) — the two-process model of sleep regulation.
- Khalsa, Jewett, Cajochen & Czeisler (2003) — the human light phase-response curve.
- Horne & Östberg (1976) — the Morningness–Eveningness Questionnaire (MEQ).
Not medical advice. Kairo estimates circadian timing; it does not diagnose or treat sleep disorders.