Heterogeneity of sleep quality in relation to circadian preferences and depressive symptomatology among major depressive patients

Apr 17, 2018Journal of affective disorders

Variations in sleep quality linked to daily rhythm types and depression symptoms in people with major depression

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Abstract

Among 225 patients with major depressive disorder, 23.6% were classified into a group with good sleep quality.

Sleep quality in major depressive disorder is multifaceted, with four distinct categories identified: Poor Habitual Sleep Quality, Poor Subjective Sleep Quality, Intermediate Sleep Quality, and Good Sleep Quality.
Patients in the Good Sleep Quality group reported the lowest levels of depressive symptoms.
Those classified in the Good Sleep Quality group showed a higher tendency towards morningness diurnal preferences compared to other groups.
A significant link was found between eveningness diurnal preferences and depressive symptoms, which was mediated by poor sleep quality.

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BACKGROUND: The current study aimed at investigating the latent dimensional structure of sleep quality as indexed by the seven components of the Pittsburgh Sleep Quality Index (PSQI), as well as latent covariance structure between sleep quality, circadian preferences and depressive symptoms.

METHODS: Two hundred twenty-five patients with major depressive disorder (MDD), with an average age of 29.92 ± 10.49 years (aged between 17 and 63), participated in the study. The PSQI, Morningness-Eveningness Questionnaire (MEQ) and Beck Depression Inventory (BDI) were administered to participants. Four sets of latent class analyses were subsequently run to obtain optimal number of latent classes best fit to the data.

RESULTS: Mixture models revealed that sleep quality is multifaceted in MDD. The data best fit to four-latent-class model: Poor Habitual Sleep Quality (PHSQ), Poor Subjective Sleep Quality (PSSQ), Intermediate Sleep Quality (ISQ), and Good Sleep Quality (GSQ). MDD patients classified into GSQ latent class (23.6%) reported the lowest depressive symptoms and were more prone to morningness diurnal preferences compared to other three homogenous sub-groups. Finally, the significant association between eveningness diurnal preferences and depressive symptomatology was significantly mediated by poor sleep quality.

LIMITATION: The cross-sectional nature of the study and the lack of an objective measurement of sleep such as polysomnography recordings was the most striking limitation of the study.

CONCLUSIONS: We concluded sleep quality in relation to circadian preferences and depressive symptoms has a heterogeneous nature in MDD.

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Heterogeneity of sleep quality in relation to circadian preferences and depressive symptomatology among major depressive patients

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