Professor Byoma Shah’s team, a researcher at the Center for Sleep Sciences at the University of California, USA, analyzed the data of polysomnography conducted on 647 subjects throughout the day and the glucose and insulin levels measured the next morning. The same experiment was then repeated in another group of 1,996 people.

As a result of the analysis, it was found that the combination of brain waves emitted when sleeping well was related to the improvement of blood sugar control ability the next morning.

Sleep EEGs are generally known to be related to learning and cognitive abilities, but this study revealed that they are also related to physiological body functions such as glucose control.

According to the research team, the principle that brain waves help to control blood sugar may be due to the activation of the parasympathetic nervous system in the brain. Getting a good night’s sleep increases the body’s sensitivity to insulin when brain waves activate parts of this nervous system, which lower blood sugar by absorbing glucose from the bloodstream into cells.

Lack of sleep time, poor sleep quality, and sleep disorders such as insomnia and sleep apnea all increase blood sugar levels, showing that getting a good night’s sleep can have a positive effect on blood sugar control.

However, these results only suggested a correlation that sound sleep can help prevent blood sugar spikes in patients with blood sugar-related diseases, but the researchers explained that they could not conclude a causal relationship between sound sleep and improved blood sugar control.

This study was published in the international medical journal ‘Cell Reports Medicine’ under the title of “Coordinated human sleeping brainwaves map peripheral body glucose homeostasis”.