Study Links Longer Sleep Duration to Increased Kidney Disease Risk in Type 2 Diabetics

Diabetic nephropathy, or diabetic kidney disease, is a significant condition resulting from long-term damage caused by type 1 or type 2 diabetes. It affects approximately 30% to 40% of people with diabetes and is a leading cause of end-stage kidney disease, as well as an increased risk of cardiovascular issues.

Tomoya Mita, M.D., Ph.D., from Juntendo University Graduate School of Medicine in Tokyo, explained, "Diabetic kidney disease is a major complication of diabetes and can ultimately lead to kidney failure and an increased risk of cardiovascular disease. Sleep is a simple and regular aspect of daily life, so our findings suggest that longer sleep duration may help identify individuals with diabetes who require closer monitoring of their kidney health."

Mita cautioned against misinterpreting the study’s findings as a suggestion to reduce sleep, noting that the research was observational and does not establish a direct causal relationship between sleep duration and kidney disease.

The researchers analyzed data from 678 Japanese individuals with type 2 diabetes, observing that increased habitual sleep duration was linked to a higher risk of diabetic nephropathy over six years of follow-up. This association was especially pronounced in older adults and those already exhibiting signs of kidney impairment, such as microalbuminuria or diminished kidney function.

Mita emphasized that while the findings suggest a correlation, longer sleep does not directly cause kidney disease; instead, it may reflect underlying health vulnerabilities.