This randomized clinical trial is focused on perimenopausal women who have difficulty sleeping. It will randomize digital cognitive behavioral therapy for insomnia (dCBT-I) or a sleep hygiene intervention (SHI). After treatment, participants will be assessed every 3-months over a 2-year period. The two main questions the study aims to answer are: 1. Do participants receiving dCBT-I experience less severe depressive symptoms compared with sleep hygiene (SH) over 2 years of study participation? 2. Are the effects of dCBT-I on depressive symptom severity mediated by an improvement in insomnia symptoms?
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Depressive symptom severity (PHQ-9 score)
Timeframe: Baseline and every 3 months post randomization for 2 years
Insomnia severity index (ISI)
Timeframe: Baseline and every 3 months post-randomization for 2 years