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Insomnia is associated with depression, acting as both a risk factor for and a manifestation of the condition (Ford and Kamerow, 1989; Livingston et al., 1993; Breslau et al., 1996; Weissman et al., 1997; Chang et al., 1997; Ohayon and Roth, 2003; Cole and Dendukuri, 2003).

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