The editorial explores the science behind why some people are naturally early risers while others thrive as night owls, drawing on insights from Dr Katherine Sharkey of the Sleep for Science Research Lab. According to Sharkey, individual differences in circadian rhythm—a biological clock tied to the 24-hour light-dark cycle—determine whether someone is an early bird or a night owl. Those with a longer natural cycle tend to be night owls, while those with a shorter cycle are more likely to wake early. This rhythm also influences body temperature patterns, with early risers reaching peak alertness earlier in the day compared to night owls. While genetics play a role, Sharkey notes that circadian rhythms shift over a lifetime, with children typically being early risers, teenagers leaning toward night owl tendencies, and adults often returning to morning preferences due to work demands.
Research on productivity suggests conflicting advantages: older studies highlight morning people’s goal-oriented focus, while more recent work from the University of Liège indicates night owls may excel in sustained attention during the workday. However, Sharkey points to potential downsides for night owls, including higher rates of depression, greater caffeine dependence, and increased alcohol use. The article concludes by offering a self-assessment of seven questions to determine one’s productivity peak—early morning, midday, or afternoon—emphasizing that while biological factors influence tendencies, lifestyle choices can also shape daily rhythms.