Here’s How Naps Affect Your Blood Sugar

Here's what to know about how naps can affect your blood sugar—whether you have diabetes or not.

For the most part, your blood sugar going up or down depends on two things, says Kevin Peterson, MD, vice president of primary care for the American Diabetes Association and a professor at University of Minnesota Medical School. It depends on your diet, he explains, and your resting blood sugar, which is your level when you wake up or haven’t eaten.

What if you need a quick, refreshing midday snooze, though? Can taking a nap affect your blood sugar levels? Dr. Peterson says keeping when you last ate and your resting blood sugar in mind when you plan the timing of your naps is key.

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Does taking a nap raise your blood sugar?

“The nap itself doesn’t change the blood sugar very much. If you haven’t eaten, and your blood sugar is at a resting level, it will stay the same. If you take a nap after you eat, it will probably go up,” Dr. Peterson explains.

Sanjay R. Patel, MD, a professor of medicine and epidemiology at the University of Pittsburgh and the medical director of the University of Pittburgh Medical Center’s Comprehensive Sleep Disorders program, says it’s hard to make generalizations about whether naps are good or bad for blood sugar because everything depends on an individual’s overall health—if they’re getting enough sleep at night, if they are generally healthy without diabetes or if they have diabetes, he says.

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Is it bad for me to nap if I have diabetes?

A nap in the afternoon can be perfectly fine if you have diabetes, Dr. Peterson says, as long as you maintain a healthy lifestyle that includes physical activity and healthy eating.

One 2016 study published in the Iranian Journal of Medical Sciences actually found that a short daytime nap can help improve blood sugar control for people with diabetes who didn’t get a great night of sleep the night before.

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“Sometimes people [with diabetes] worry about what might happen if their blood sugar gets low during a nap, but a low blood sugar will usually wake you up,” Dr. Peterson explains.

“If you are having lots of lows, however, then you should see your doctor. If your blood sugar is well controlled, then finding a good time to nap is mostly a personal preference,” he adds.

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Should I nap if I don’t have diabetes?

What about naps if you don’t have diabetes…is that OK?

2016 research published in Scientific Reports found naps under 60 minutes were not linked to diabetes, while a 2016 study published in peer-reviewed journal SLEEP found that naps over 40 minutes were linked to increased risk for metabolic disease. So if you’re dozing off, a 30-minute timer could be the solution.

You may also want to be careful with how often you take a siesta. A 2017 analysis of seven studies which examined the relationship between napping and Type 2 Diabetes found that in general, people who took habitual daytime naps had a 17% higher chance of developing diabetes compared to those who didn’t nap during the day. A 2023 study published in Nutrition & Metabolism also linked regular daytime napping with a risk for diabetes in most adults.

So if you want to avoid doing damage to your blood sugar levels, research suggests keeping your naps short, sweet and infrequent.

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Current Diabetes Reports: "Sleep Duration and Diabetes Risk: Population Trends and Potential Mechanisms." SLEEP: "Daytime Napping and the Risk of Cardiovascular Disease and All-Cause Mortality: A Prospective Study and Dose-Response Meta-Analysis." Scientific Reports: "J-curve relation between daytime nap duration and type 2 diabetes or metabolic syndrome: A dose-response meta-analysis." Nutrition and Metabolism: "Association of daytime napping in relation to risk of diabetes: evidence from a prospective study in Zhejiang, China." CDC: "Sleep for a Good Cause." Johns Hopkins Medicine: "Oversleeping: Bad for Your Health?" Mayo Clinic: "How many hours of sleep are enough for good health?" National Institute of Digestive and Diabetes and Kidney Diseases: "The Impact of Poor Sleep on Type 2 Diabetes."

Kristen Fischer
After earning a science degree from Stockton University, Kristen Fischer ( decided to pursue writing instead. Since then, she has written about women's health, psychology, parenting, mental health--and everything in between. Her work has been published at Prevention, WebMD, Healthline, Motherly, and Parade. Kristen loves translating scientific jargon so people are empowered about their health. She lives at the Jersey Shore with her husband, son, and four cats.