Can poor sleep cause me to develop diabetes sooner?

People who chronically sleep too little have a 37% higher risk of type 2 diabetes than people with a normal sleep duration. This emerges from prospective cohort studies involving more than 5 million participants. People who regularly work night shifts also face an elevated risk of roughly 9 to 40 percent compared with people who keep a normal day-night rhythm.

The body makes that connection in several ways. Sleep restriction makes cells less sensitive to insulin and disrupts insulin production in the pancreas. At the same time, hunger hormones shift in an unfavourable direction: the hunger hormone ghrelin rises, while the satiety hormone leptin falls. You end up eating more than you need, you gain weight, and excess weight in turn increases the risk of diabetes even further.

On top of that, chronic sleep deprivation raises low-grade inflammation in the body. That background inflammation contributes to the development of type 2 diabetes, but also to atherosclerosis and other conditions. There are therefore multiple biological pathways all pointing in the wrong direction at the same time when sleep is poor or too short.

Sleep apnoea deserves a separate mention. This sleep disorder, in which you repeatedly stop breathing for brief moments during the night, is strongly associated with excess weight and diabetes. The three reinforce one another. Treating sleep apnoea certainly helps with symptoms, but whether it also reduces the risk of diabetes over the long term has not yet been well studied.

The message is therefore fairly concrete: it is not only about how many hours you sleep, but also about the regularity of your sleep schedule. Consistently sleeping fewer than seven hours per night appears to carry a real, measurable risk. The more of those additional risk factors that combine in your situation (sleeping too little, irregular hours, sleep apnoea, excess weight), the greater the cumulative effect.