New Genetic Test Reveals Your Body's Hidden Sleep-Wake Clock

A new genetic test can now reveal a person's internal body clock with high precision. By analysing just 17 genes from hair follicle cells, the method determines when an individual naturally feels alert or tired. Researchers say it could transform how treatments are timed for maximum effectiveness. The test was developed to support circadian medicine—an emerging field that tailors medical care to a patient's unique biological rhythms. Unlike traditional saliva tests, which are cumbersome, this approach uses machine learning to map circadian patterns from gene activity. Over 4,000 people have already taken the test to identify their chronotype, the natural timing of their sleep-wake cycle.

Findings show clear differences between groups. Employed individuals tend to have internal clocks running about 30 minutes earlier than those without jobs. Age also plays a role: people in their mid-20s stay alert roughly an hour later than those over 50. Even gender affects timing—women's bodies signal the start of 'biological night' about six minutes earlier than men's. The test's accuracy rivals older methods but is far simpler to perform. Its creators believe it will enable *timed healthcare*, where medications, surgeries, or therapies are scheduled for the moment they'll work best in a patient's daily cycle.

With this test, doctors may soon adjust treatments based on a patient's internal clock. The approach could improve outcomes by aligning care with natural rhythms. Circadian medicine is now a step closer to becoming standard practice in hospitals and clinics.