“…A substantial proportion of university students are affected by poor sleep quality (Kloss et al, ; Lemma et al, ). The results were consistent with previous studies on adolescents that reported a positive association between insomnia and depression, insomnia and generalized anxiety disorder (de Araújo et al, ; Gregory & O'Connor, ; Saxvig et al, ). The relationships observed between insomnia, generalized anxiety disorder, and depression may be at least partially explained by abnormalities in neurotransmitters and brain structures such as dopamine, hypocretin‐1, serotonin, the brainstem, and thalamus, which are associated with the sleep‐wake cycle, anxiety, and depression (Casey, Jones, & Hare, ; Gregory & O'Connor, ; Holmes, Murphy, & Crawley, ; Nestler & Carlezon, ; Tseng & O'Donnell, ).…”