S
Sakari Lemola
Researcher at Bielefeld University
Publications - 102
Citations - 3551
Sakari Lemola is an academic researcher from Bielefeld University. The author has contributed to research in topics: Medicine & Slow-wave sleep. The author has an hindex of 29, co-authored 87 publications receiving 2796 citations. Previous affiliations of Sakari Lemola include University of Helsinki & University of Basel.
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Adolescents’ Electronic Media Use at Night, Sleep Disturbance, and Depressive Symptoms in the Smartphone Age
TL;DR: Electronic media use was negatively related with sleep duration and positively with sleep difficulties, which in turn were related to depressive symptoms, and sleep difficulties were the more important mediator than sleep duration.
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Variability of sleep duration is related to subjective sleep quality and subjective well-being : An actigraphy study
TL;DR: The findings show that great day-to-day variability in sleep duration – more than averageSleep duration – is related to poor subjective sleep quality and poor subjective well-being.
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Are Adolescents With High Mental Toughness Levels More Resilient Against Stress
Markus Gerber,Nadeem Kalak,Sakari Lemola,Peter J. Clough,John L. Perry,Uwe Pühse,Catherine Elliot,Edith Holsboer-Trachsler,Serge Brand +8 more
TL;DR: Consistent across the two samples, mental toughness mitigated the relationship between high stress and depressive symptoms, and the interaction between stress and mental toughness explained 2% of variance in the adolescent sample and 10%" of variance among young adults.
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Validation of the German version of the Insomnia Severity Index in adolescents, young adults and adult workers. Results from three cross-sectional studies
Markus Gerber,Christin Lang,Sakari Lemola,Flora Colledge,Nadeem Kalak,Edith Holsboer-Trachsler,Uwe Pühse,Serge Brand +7 more
TL;DR: This study is the first to provide empirical evidence that the German version of the Insomnia Severity Index has good psychometric properties and satisfactory convergent and factorial validity across various age groups and both men and women.
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Sleep duration, positive attitude toward life, and academic achievement: The role of daytime tiredness, behavioral persistence, and school start times
TL;DR: Examination of the relationship of sleep duration with positive attitude toward life and academic achievement in a sample of 2716 adolescents in Switzerland found students who started school 20 min later received reliably more sleep and reported less tiredness.