Pigeon, Pinquart, and Conner, “Meta-Analysis of Sleep Disturbance.”

Spiegelhalder, Regen, et al., “Comorbid Sleep Disorders”; Pires, Bezerra, et al., “Effects of Acute Sleep Deprivation.”

Kessler, “Epidemiology of Women and Depression”; de Girolamo, et al., “Prevalence of Common Mental Disorders in Italy”; Faravelli, et al., “Gender differences in depression and anxiety: the role of age.”