Sleep quality and sleep disorders affect symptom manifestation and the pathogenesis of digestive diseases. Sleep is largely regulated by the light-dark cycle and associated circadian rhythms. These occurrences are closely regulated through several mechanisms with direct effects on the gastrointestinal tract. Misalignment of the circadian system is a common cause of sleep complaints, which play an important role in the presentation of many gastrointestinal disorders. This Review will focus on sleep disorders and how these alterations in sleep play an important role in many commonly encountered digestive diseases, such as gastro-oesophageal reflux disease, irritable bowel syndrome, inflammatory bowel disease, and non-alcoholic fatty liver disease. Therapeutic interventions focusing on resolving sleep disorders could optimise treatment and improve quality of life in these patients.
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