Science and Technology Daily, Beijing, March 14th (intern reporter Zhang Jiaxin) Before going to bed, please close the blinds, close the curtains, and turn off all the lights.

Sleeping in moderately lit environments can impair cardiovascular function and lead to higher levels of insulin resistance the next morning, compared with sleeping in a dimly lit room at night, reports a new study from Northwestern University School of Medicine. , thereby increasing the risk of heart disease and diabetes.

　　The findings suggest that exposure to room lighting for just one night during sleep impairs blood sugar and cardiovascular regulation, which are risk factors for heart disease, diabetes and metabolic syndrome.

Therefore, it is important for people to avoid or minimize light exposure during sleep.

　　The sympathetic and parasympathetic nervous systems regulate human physiological functions during the day and night, respectively.

There is already evidence that exposure to sunlight during the day increases heart rate by activating the sympathetic nervous system, which keeps the heart racing and increasing alertness for the challenges of the day.

The results of this study suggest that similar effects occur when exposed to light during nighttime sleep.

　　Research has found that heart rate increases when sleeping in a well-lit room.

Even when a person is asleep, the autonomic nervous system is activated so the body cannot rest properly.

　　The researchers advise against turning on the lights during nighttime sleep if it is safe to do so.

At the same time, the color of the light is important, amber or orange-red light is less stimulating to the brain; do not use white or blue light.

If you cannot control the outdoor light source, you can choose to wear a sunshade or eye mask or move the position of the bed to avoid the light.

　　How can you tell if your room is too bright?

"If you can see clearly, the room is probably too bright," the researchers said.

　　The study was published in the Proceedings of the National Academy of Sciences on the 14th local time.