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In page Obstructive sleep apnea:

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Individuals with Type 2 diabetes are often co-diagnosed with OSA, where Type 2 diabetes prevalence rates range between 15% to 30% within the OSA population.[9] The relationship between OSA and Type 2 diabetes could possibly be explained by the fact that OSA-characteristic fragmented sleep and irregular hypoxemia leads to the dysregulated metabolism of glucose in the blood.[9] In particular, many polysomnography studies showed that OSA left untreated worsens glycemic control in individuals withType 2 diabetes.[9] However, it is possible that the relationship between OSA and Type 2 diabetes is bidirectional since diabetes-related nerve dysfunction may affect the respiratory system and induce breathing disturbances during sleep.[9]