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This study examines the associations between overall pre-sleep arousal, its cognitive and somatic subscales and insomnia symptoms. Furthermore, the relative contribution of genetic and environmental influences on overall pre-sleep arousal, cognitive pre-sleep arousal, somatic pre-sleep arousal, and insomnia symptoms and the association between these variables is estimated.

Associations between pre-sleep arousal and insomnia symptoms in early adulthood: a twin and sibling study