Your baby's internal sleep clock helps put her to sleep at a certain hour, and helps wake her up at pretty much the same time each morning. (sleepconsultantprogram.com)
For most animals, internal clocks help them perform recurring daily activities, like eat, sleep and hunt, at the most appropriate time of day. (sciencenews.org)
Researchers now know our biological clocks help regulate sleep patterns, feeding behavior, hormone release, blood pressure and the body's temperature, among other vital processes. (scientificamerican.com)