Staying up past bedtime, skipping meals, and snacking constantly all add up to weight gain, fatty livers, and high cholesterol levels for an unlucky group of mice whose internal biological clocks are... (hhmi.org)
According to our bodies» own internal biological clocks, there is a best time for just about everything we do — including sex. (mindbodygreen.com)
Since newborns do not yet have an internal biological clock or circadian rhythm, their sleep patterns are not related to the daylight and nighttime cycles. (verywellfamily.com)