E-aid Sleep-focused TrEatment for Prevention of Major Depression (STEP-MD)

In the past, there were studies on relationship between insomnia and depression, and those studies found that depression can be the result of untreated insomnia. Mostly insomnia precedes depression, and is a marker for recurrence of depression. Research suggests that insomnia may cause depression by changing the emotional response. In this study, investigators will establish the national online cognitive behavioral therapy for insomnia (e-aid Cognitive Behavioral Therapy for Insomnia, eCBTI ) tools, and online health education on sleep (e-aid Sleep Hygiene Education, eSHE ) tools for controls. Investigators will be testing whether eCBTI can reduce the incidence of depression in patients with sleep disorders, increasing remission rate of depression, and a corresponding reduction in suicidal ideas, compared with eSHE control groups.