Recent years have seen an expansion in the number of conditions that are recognized as having a link with diabetes. In people with sleep apnoea breathing stops briefly but repeatedly during sleep. It is commonly associated with obesity, and therefore frequently occurs in people with type 2 diabetes. However, recent research demonstrates the likelihood of a relationship between obstructive sleep apnoea and diabetes that is independent of obesity. The links between the conditions are particularly important as both increase the risk of cardiovascular disease.