They proved how the biological mechanism works inside our cells.
The Nobel Prize for Physiology (or Medicine) was announced on Oct. 2 in Sweden. Three American scientists jointly took home this prestigious award for their work on circadian rhythms. This is the biological clock all organisms have which controls our sleep-wake cycle, the release of hormones at important intervals, body temperature, blood pressure, and other critical mechanisms, in order to maintain homeostasis or balance.
A "new" field of medicine called chronotherapy demonstrates that following nature's cycles, as our ancestors did, is integral to proper biological and cognitive function.