A good night’s sleep may be doing far more than helping you feel refreshed the next morning.
According to new research, it could also help protect your liver, especially if you have type 2 diabetes. Scientists have found that poor sleep during the night, combined with long daytime naps, is linked with a much greater risk of developing metabolic dysfunction-associated steatotic liver disease (MASLD). The findings were published in Diabetology & Metabolic Syndrome.
Type 2 diabetes already increases the chance of many health problems, including heart disease, kidney disease, eye damage, and nerve damage.
Another common problem is MASLD, a condition in which excess fat collects inside the liver. Many people do not notice symptoms at first, but over time the disease can progress to inflammation, scarring, cirrhosis, and even liver cancer if it is not managed.
To better understand whether sleep plays a role, researchers at the First Affiliated Hospital of Wenzhou Medical University studied 1,900 adults with type 2 diabetes. Participants ranged from 18 to 85 years old and were followed for an average of just over three years.
The researchers grouped people according to their nighttime sleep quality and the amount of time they spent napping. They discovered that both poor sleep at night and naps lasting longer than 30 minutes were associated with a higher chance of developing MASLD.
The greatest danger occurred in people who slept poorly at night and also took long naps. Their risk was more than three times higher than people who enjoyed healthy nighttime sleep and only short naps.
The researchers also tested whether sleep information could improve a commonly used fatty liver risk score. It did. Including sleep habits helped doctors identify people who were more likely to develop MASLD, showing that sleep may become a useful part of future health screening.
Although scientists are still studying the biological reasons, lack of quality sleep is known to affect blood sugar control, inflammation, hormones, metabolism, and the body’s natural daily rhythm. All of these factors can contribute to fat building up in the liver. Long daytime naps may also indicate that nighttime sleep is not providing enough rest.
The researchers believe these findings could help doctors identify high-risk patients earlier and encourage sleep improvements before liver disease becomes more severe. Practical habits such as maintaining regular sleep times, creating a quiet sleeping environment, limiting caffeine late in the day, and avoiding unnecessarily long naps may become part of future liver health advice.
One of the strengths of this research is its large number of participants and years of follow-up. However, it shows an association rather than proving cause and effect. Improving sleep may reduce risk, but clinical trials will be needed to confirm this. Even so, the study highlights sleep as an important and often overlooked part of diabetes management and liver health.
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Source: First Affiliated Hospital of Wenzhou Medical University.
