The association between affective temperaments and insomnia as mediated by satisfaction with life: a cross-sectional study.

Background: The primary objectives of this study were to examine whether affective temperaments are associated with satisfaction with life; to determine whether satisfaction with life can mediate the relationship between affective temperaments and insomnia; and to reaffirm the relationship between affective temperaments and insomnia. We hypothesized that affective temperaments were associated directly and indirectly via satisfaction with life with insomnia.

Participants and procedure: A total of 497 participants aged 18 to 67 years, including 435 women and 62 men, were recruited from the general population via an online recruitment platform. We used the Temperament Evaluation of the Memphis, Pisa, Paris and San Diego Autoquestionnaire to evaluate affective temperaments and the Satisfaction with Life Scale to assess satisfaction with life. The Athens Insomnia Scale was used to assess participants' level of insomnia symptoms.

Results: Depressive, cyclothymic, irritable and anxious temperaments correlated positively with insomnia symptoms, but hyperthymic temperament correlated negatively with insomnia symptoms. Satisfaction with life correlated negatively with insomnia symptoms. Hyperthymic temperament correlated positively with satisfaction with life, but depressive, cyclothymic, irritable and anxious temperaments correlated negatively with satisfaction with life. Hierarchical regression analysis indicated that 30% of the variance in insomnia symptoms was attributable to satisfaction with life level and the presence of cyclothymic and anxious temperaments. The mediation analysis suggested a significant indirect effect of cyclothymic and anxious temperaments on insomnia through satisfaction with life as a mediator between affective temperaments and insomnia.

Conclusions: Cyclothymic and anxious temperaments can influence the symptoms of insomnia directly and indirectly as mediated by satisfaction with life.