1. If you are a woman, are you worried your biological clock is ticking and you still have no plans to have a baby?2. Drinking plenty of water while waking up is one of the best things you can do for your circadian rhythms in the morning, but you don't want to do that at night.3. Sleeping at night and getting up in the morning is an example of a circadian rhythm.
 biological clock circadian rhythmsbiological clock = 生理時鐘circadian rhythms = 晝夜節律，是一種生理現象，持續的以約24小時為週期的心理、生理、行為變動，可用在人或其他生物上。