Chronotype and Smartphone Use among Japanese Medical Students

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The authors investigated associations between smartphone use and chronotype. To 196 medical university students, they administered a set of self-reporting questionnaires designed to evaluate smartphone use and chronotype. Respondents were categorized into morning types and evening types: for females, the evening types scored higher for smartphone dependence; the authors also found greater duration of Web browsing service, in particular Twitter, in the evening types. No such correlation was found for male respondents. These findings provide evidence that, particularly for females, smartphone use and/or dependence may be related to chronotype.