Inability to respond to changes in sleep patterns proves to be at higher risk of developing depression than lack of sleep



Various studies have already demonstrated that regular sleep and long sleep are good for your health, and it is a well-known fact. However, Yu Fang, a neuroscientist

at the University of Michigan, who believed that most of these findings depended on self-reporting and prehistoric measurement methods, conducted a study using wearable devices to describe sleep patterns. It was revealed that it is related to the development of depression.

Day-to-day variability in sleep parameters and depression risk: a prospective cohort study of training physicians | npj Digital Medicine
https://www.nature.com/articles/s41746-021-00400-z

Fang and colleagues surveyed 2,115 medical doctors who graduated from medical school and proceeded to an internship course. Internships are the first step built into the American clinical training system and require a one-year period to complete, but the rapid increase in workload and fluctuating schedules will lead to a surge in the incidence of depression. Many research results have been reported.



According to a survey by Fang et al., Interns were made to wear wearable devices that measure sleep time and regularly report their mood via the Internet. Then, before and after the start of the internship, a depression check test '

PHQ-9 ' was conducted to see how changes in wake-up time, bedtime, daily sleep time, etc. are related to the onset of depression. I analyzed it.

As a result of the survey, the median wake-up time after the start of the internship was 1 hour earlier, and the median bedtime was 30 minutes earlier. It was also found that the PHQ-9 score increased by an average of 3.5 points before and after the internship, increasing the risk of depression for internship students.



In addition, Fang et al. Measured sleep patterns for about 130 days on average through the survey. Analysis based on this data found that the less sleep you had, the worse your mood and PHQ-9 score the next day. In addition, the earlier the wake-up time, the worse the mood and PHQ-9 score, while the earlier the bedtime, the better the mood and PHQ-9 score.

Regarding this result, Fang et al. Stated that 'people who can control bedtime well according to fluctuations in wake-up time have stable sleep quality, and those who cannot, have poor sleep quality.'

Fang et al. Conclude that 'potentially, fluctuations in

circadian rhythms are more likely to have a negative impact on mental health than lack of sleep.'



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