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

Research on individual differences in the fields of chronobiology and chronopsychology mostly focuses on two – morning and evening – chronotypes. However, recent developments in these fields pointed at a possibility to extend chronotypology beyond just two chronotypes. We examined this possibility by implementing the Single-Item Chronotyping (SIC) as a method for self-identification of chronotype among six simple chart options illustrating the daily change in alertness level. Of 2283 survey participants, 2176 (95%) chose one of these options. Only 13% vs. 24% chose morning vs. evening type (a fall vs. a rise of alertness from morning to evening), while the majority of participants chose four other types (with a peak vs. a dip of alertness in the afternoon and with permanently high vs. low alertness levels throughout the day, 15% vs. 18% and 9% vs. 16%, respectively). The same 6 patterns of diurnal variation in sleepiness were yielded by principal component analysis of sleepiness curves. Six chronotypes were also validated against the assessments of sleep timing, excessive daytime sleepiness, and abilities to wake or sleep on demand at different times of the day. We concluded that the study results supported the feasibility of classification with the 6 options provided by the SIC. © 2020 Elsevier Ltd

Putilov A.A. 1, 2 , Sveshnikov D.S. 3 , Puchkova A.N. 2 , Dorokhov V.B. 2 , Bakaeva Z.B. 3 , Yakunina E.B. 3 , Starshinov Y.P. 3 , Torshin V.I. 3 , Alipov N.N.4 , Sergeeva O.V.4 , Trutneva E.A.5 , Lapkin M.M.5 , Lopatskaya Z.N.6 , Budkevich R.O. 7 , Budkevich E.V. 7 , Dyakovich M.P.8 , Donskaya O.G. 1 , Plusnin J.M.9 , Delwiche B.10 , Colomb C.11 , Neu D.11, 12 , Mairesse O.11, 12
Elsevier Ltd
  • 1 Research Group for Math-Modeling of Biomedical Systems, Research Institute for Molecular Biology and Biophysics of the Federal Research Centre for Fundamental and Translational Medicine, Novosibirsk, Russian Federation
  • 2 Laboratory of Sleep/Wake Neurobiology, Institute of Higher Nervous Activity and Neurophysiology of the Russian Academy of Sciences, Moscow, Russian Federation
  • 3 Department of Normal Physiology, Medical Institute of the Peoples' Friendship University of Russia, Moscow, Russian Federation
  • 4 Department of Physiology, Pirogov's Russian National Research Medical University, Moscow, Russian Federation
  • 5 Department of Physiology, Ryazan State Medical University, Ryazan, Russian Federation
  • 6 Department of Physiology, Medical Institute of the of Surgut State University, Surgut, Russian Federation
  • 7 Laboratory of Nanobiotechnology and Biophysics, the North-Caucasus Federal University, Stavropol, Russian Federation
  • 8 Department of Economics, Marketing and Personnel Management, Angarsk State Technical University, Angarsk, Russian Federation
  • 9 Department of Public Administration, National Research University Higher School of Economics, Moscow, Russian Federation
  • 10 Faculty of Psychology and Educational Sciences, Vrije Universiteit Brussel, Brussels, Belgium
  • 11 Sleep Laboratory and Unit for Clinical Chronobiology, Brugmann University Hospital of the Vrije Universiteit Brussel, Brussels, Belgium
  • 12 Center for Sleep Disorders, DELTA-CHIREC, Brussels, Belgium
Afternoon dip; Afternoon type; Alertness; Chronotypology; Morningness-eveningness; Sleep times; Sleep-wake pattern; Sleepiness
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