The wisdom of tradition.
Proven by science.

Classical Ayurveda's Charaka Samhita names indulgence in sleeping as one cause of prameha, the urinary disorders that include the diabetic condition madhumeha, grouped alongside poor diet, no exercise, and sedentary habits as factors that increase kapha, fat, and urine. The same text also lists somnolence as an early warning sign of the disease, a separate role from sleep as a cause. It's worth noting Charaka is describing an entire overfed, underactive lifestyle, not singling out sleep alone, and it says nothing about sleep deprivation.

What the science saysThe long-sleep half of this claim holds up: a large meta-analysis of prospective cohorts found a U-shaped link between sleep duration and diabetes risk, with long sleepers at higher risk too, but the reverse direction, sleep restriction, is what modern trials actually show lowers insulin sensitivity.