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European Child & Adolescent Psychiatry

, Volume 26, Issue 10, pp 1233–1244 | Cite as

Not later, but longer: sleep, chronotype and light exposure in adolescents with remitted depression compared to healthy controls

  • Lena Katharina Keller
  • Barbara Grünewald
  • Céline Vetter
  • Till RoennebergEmail author
  • Gerd Schulte-Körne
Original Contribution

Abstract

The relationship between sleep and adolescent depression is much discussed, but still not fully understood. One important sleep variable is self-selected sleep timing, which is also referred to as chronotype. Chronotype is mostly regulated by the circadian clock that synchronises the internal time of the body with the external light dark cycle. A late chronotype as well as a misalignment between internal time and external time such as social jetlag has been shown to be associated with depressive symptoms in adults. In this study, we investigated whether adolescents with remitted depression differ from healthy controls in terms of chronotype, social jetlag and other sleep-related variables. For this purpose, we assessed chronotype and social jetlag with the Munich ChronoType Questionnaire (MCTQ), subjective sleep quality with the Pittsburgh Sleep Quality Index (PSQI) and used continuous wrist-actimetry over 31 consecutive days to determine objective sleep timing. Given the potentially mediating effect of light on chronotype and depressive symptoms, we measured light exposure with a light sensor on the actimeter. In our sample, adolescents with remitted depression showed similar chronotypes and similar amounts of social jetlag compared to controls. However, patients with remitted depression slept significantly longer on work-free days and reported a worse subjective sleep quality than controls. Additionally, light exposure in remitted patients was significantly higher, but this finding was mediated by living in a rural environment. These findings indicate that chronotype might be modified during remission, which should be further investigated in longitudinal studies.

Keywords

Chronotype Adolescent depression MCTQ Sleep Light exposure Wrist actigraphy 

Notes

Acknowledgements

We thank Verena Pehl and Hannah Luderer for assistance with data collection and Belinda Platt for helpful comments on the manuscript. This work was supported by the Förderprogramm Forschung und Lehre (FöFoLe) Program of the Ludwig-Maximilians-University Munich, Germany (Grant No. 761).

Compliances with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Lena Katharina Keller
    • 1
    • 2
  • Barbara Grünewald
    • 1
  • Céline Vetter
    • 3
  • Till Roenneberg
    • 2
    Email author
  • Gerd Schulte-Körne
    • 1
  1. 1.Department of Child and Adolescent Psychiatry, Psychosomatics and PsychotherapyUniversity Hospital MunichMunichGermany
  2. 2.Institute for Medical Psychology, Human ChronobiologyLudwig-Maximilians-UniversityMunichGermany
  3. 3.Channing Division of Network MedicineBrigham and Women’s Hospital and Harvard Medical SchoolBostonUSA

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