Human sleep types are not limited to morning and night types, what are the 'six sleep types' explained by experts?

The rhythm of human life based on sleep is called

chronotype, and when talking about chronotype, it is divided into 'morning type that starts activity early in the morning' and 'night type that is active until late at night'. Most of the time. However, a Russian research team points out that 'there are not only two human chronotypes, morning and night,' and claims that there are 'six chronotypes' based on human arousal and activity patterns. I will.

Single-Item Chronotyping (SIC), a method to self-assess diurnal types by using 6 simple charts --ScienceDirect

Doctors confirm the existence of multiple chronotypes | EurekAlert! Science News

There Are 6 Human Chronotypes, Not Just Morning Larks And Night Owls, Study Says

Physiological functions in the human body are strongly influenced by circadian rhythms , and while some people can be active early in the morning, others can be active late into the night instead of being weak in the morning. It has been found that these differences between morning and night types are related not only to environmental factors such as age, gender, and daylight hours, but also to genetic factors .

Widely known chronotypes include the morning type, which is active in the morning, and the night type, which is active in the evening, and many studies have focused on these two chronotypes. However, recent studies have suggested that chronotypes are not simple and can be classified into stereotyped morning and night types, and that there are more diverse chronotypes .

Dmitry S. Sveshnikov, a physiologist at the People's Friendship University of Russia , said that although individual chronobiological and temporal psychological studies have focused primarily on morning and night chronotypes, recently The study conducted a chronotype study of more than 2000 people, suggesting that existing classifications need to be revisited and expanded.

According to the research team, the 2015 study in addition to the presence of, in addition to the morning-evening type as 'sleepiness is strong type throughout the day,' 'sleepiness is weak type throughout the day' is found, of the 2019 study in the ' It is said that 'a type that becomes drowsy during the day and becomes drowsy in the morning and night' and 'a type that becomes drowsy during the day and becomes drowsy in the morning and night' have been identified.

Below is a graph showing the 'six chronotypes' devised by the research team based on these studies. The color-coded horizontal axis shows morning, noon, and night in order from the left, and the vertical axis shows the strength of alertness. From top left, 'MORING TYPE (morning type)' 'EVENING TYPE (night type)' 'HIGHLY ACTIVE TYPE (always high arousal type)' 'DAYTIME SLEEPY TYPE (low awakening type in the daytime)' 'DAYTIME TYPE' (Awakening level is high in the daytime) '' MODERATELY ACTIVE TYPE (Awakening level is always low) '.

The research team conducted an online survey based on six chronotypes and collected responses from a total of 2283 people. Many of the respondents were college students and self-assessed whether they fit the six chronotypes or not. He also answered questions that sleep scientists use to evaluate drowsiness at various times, as well as questions about bedtime and wake-up times on weekdays and weekends.

Analysis of the survey responses revealed that 95% of the total, or 2176 people, fell into one of the six chronotypes. Looking at the breakdown, 13% are 'morning type', 24% are 'night type', 18% are 'types with low alertness in the daytime', 16% are 'always low alertness type', and 15%. Is 'a type with a high degree of arousal in the daytime' and 9% is a 'type with a high degree of awakening at all times', and it can be seen that only 37% of the total applies to 'morning type' and 'night type'. I will.

This study was relatively small, but the team will be able to see how these six chronotypes affect people by doing more techniques in the future. Insisted on.

in Science, Posted by log1h_ik