REM Sleep and Blood Sugar Control: What New Research Reveals for Type 1 Diabetes

Sleep affects nearly every system in your body, including how your body handles blood sugar. Yet most research on Type 1 diabetes focuses on insulin, diet, and exercise. A new study published in Diabetes, Obesity & Metabolism looked at a piece of the puzzle often overlooked: the relationship between the *type* of sleep you get and how well your glucose stays in range.

Researchers followed 179 adults with long-standing Type 1 diabetes, tracking their sleep with wearable devices and their blood glucose with continuous glucose monitors (CGMs) for 14 days. They also measured markers of early heart disease. What they found suggests that one particular stage of sleep—REM sleep—may play an important role in blood sugar control.

REM (rapid eye movement) sleep is the stage where you dream. In this study, adults who spent less time in REM sleep had higher HbA1c levels—a measure of average blood sugar over three months. They also had more time spent above their target glucose range and greater glucose variability from day to day.

The connection held up even after researchers accounted for total sleep time, age, and sex. This suggests it's not just about sleeping enough hours—the *composition* of your sleep matters. When REM sleep made up a smaller proportion of total sleep time, glucose control tended to be worse across multiple measures.

The study also looked at signs of early atherosclerosis—fatty deposits in the neck arteries that can lead to heart disease. Adults who had two or more carotid plaques had about 9 minutes less REM sleep compared to those without these plaques. People with Type 1 diabetes already face higher cardiovascular risk, so this finding adds another reason to pay attention to sleep quality.

This research is observational, meaning it shows associations rather than proof that shorter REM sleep *causes* poor glucose control. Many factors influence both sleep and blood sugar, and this study captured only a snapshot of two weeks.

That said, the findings align with what we know: sleep is a pillar of diabetes management alongside insulin, food, and movement. If you're struggling with blood sugar stability, it may be worth asking yourself whether you're getting enough quality sleep. If sleep problems persist, talk to your healthcare team—they may recommend a sleep study or refer you to a specialist.

Wearable devices like smartwatches can now track sleep stages, giving you real-time insight into your sleep architecture. Pairing that data with your CGM readings might reveal patterns unique to you. This is one example of how technology can help personalize diabetes care.

Source: Diabetes, obesity & metabolism. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.