The greatest difference in chronotypes is during adolescence and early adulthood.Chronotypes become later during adolescence, peaking in lateness at about age 19. They found that sleep chronotypes vary widely, both over an individual’s lifetime among age groups as well as among individuals. They used the mid-point of sleep on weekends as a proxy for chronotype. Researchers from Harvard TH Chan School of Public Health in the US analysed self-reported data from 53,689 respondents of the American Time Use Survey from 2003 to 2014. Most public schools start at 8:30 am or earlier, suggesting that high school students go to school during their biological night. For example, people with early chronotypes have earlier sleep times, while those with late chronotypes have later sleep times and can sleep into the day. People’s circadian systems synchronise with light and darkness in the environment, giving rise to chronotypes: individual rhythms in physiology, cognition and behaviour. One of the major reasons for sleeping troubles among teenagers could be loneliness, suggested another study.
A subsequent study showed that lack of sleep or going to bed late can affect the brains of growing teenagers. In the past, studies had shown that teenagers who get up in the night to check messages on social media are more likely to feel constantly tired at school than others. The timing for optimal sleep can be as different as ten hours among individuals.(Shutterstock) The sleep rhythms that reflect circadian systems peak later in teenagers than in adults, and vary as much as 10 hours in individuals across ages, researchers said. They suggest that delaying school start times could help minimise health risks among students. Now, a new study by Harvard scientists says that teenagers have naturally delayed sleep rhythms which cause them to wake up late. A lot of research has been done on the role of sleep for teenagers.
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