The first experiments in this area began in 1981. With the help of the test, the first participants determined their chronotype and talked about addictions. The median age of the participants was 41. The study ended in 2018: more than 8.7 thousand people had died by that time.
Finnish scientists this time took into account the factor of bad habits and found that among such night owls the mortality rate is 9% higher than among those who get up early and go to bed early. There is no such mortality rate for those who sleep during the day and stay awake at night but do not have an addiction. Sleep patterns have also been associated with a number of addictive psychiatric disorders.
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Source: Ferra
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