Studies have shown that sleep is independently linked with longevity and that modern technology affects sleep. For example, the artificial light from TV and computer screens affects melatonin production and throws off circadian rhythms, preventing deep, restorative sleep. New research at the University of Gothenburg’s Sahlgrenska Academy has shed additional light on this topic. Sara Thomée, doctoral student, and colleagues conducted four studies to evaluate the effects of heavy computer and cell phone by young adults on sleep quality, stress levels, and general mental health. The studies found that young adults who make particularly heavy use of mobile phones and computers run a greater risk of sleep disturbances, stress, and symptoms of mental health. Heavy use of mobile phones was linked to an increase in sleeping problems in males and an increase in depressive symptoms in both males and females.