In a groundbreaking study, researchers have identified what might be the perfect amount of sleep to potentially fend off insulin resistance, a precursor to type 2 diabetes. This extensive analysis, which examined over 23,000 participants, suggests that an ideal sleep duration is seven hours and 18 minutes. Individuals who clocked less than this optimal amount of rest tended to exhibit higher scores on the estimated glucose disposal rate (eGDR) scale—a key measure used to identify insulin resistance. A lower eGDR score is associated with increased risk.

Conducted by a team of researchers from China using data from American adults, the study also delved into the effects of weekend sleep recovery. It was observed that compensating for lost sleep by getting more rest on the weekends was associated with an improved eGDR. However, the researchers cautioned that such catch-up sleep is beneficial only when done in moderation and specifically for those who incur a sleep deficit during the weekdays. For individuals who already enjoy sufficient sleep, this practice could actually be detrimental.

Published in the journal BMJ Open Diabetes Research and Care, the study’s authors emphasized the importance of personalized sleep recommendations in healthcare settings. They advocate for a consistent and adequate sleep routine throughout the week rather than relying on weekend recovery. The researchers also highlighted the necessity for further investigation into how sleep patterns influence metabolic health risks.

Professor Naveed Sattar, a renowned cardiometabolic medicine specialist at the University of Glasgow, advised interpreting these findings with caution. He pointed out that the study’s observational nature does not establish a direct causal link between sleep duration and changes in eGDR.

Professor Sattar remarked, “There is substantial evidence indicating that shorter sleep—generally less than seven hours per night—is associated with a heightened risk of developing type 2 diabetes. Poor sleep can lead to disrupted appetite, prompting individuals to consume more food following a restless night, and being awake for longer periods increases the chances of eating.”

“Poor sleep disrupts appetites, meaning people often eat more after a poor night’s sleep, and simply being awake for longer creates more opportunities to eat.

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“In addition, inadequate sleep may directly affect key hormones, including stress hormones, that influence glucose levels.”

Genetic studies also suggest that people predisposed to shorter sleep are at higher risk of future diabetes, Prof Sattar said.

He added: “The practical message is that people should work hard at developing good sleep hygiene: going to bed at consistent times, creating a wind down routine, and reducing screen use — particularly mobile phones — in the hour before bed.

“The easy access to digital distractions is likely contributing to declining sleep quality and duration, which may in turn contribute to more obesity and diabetes.”