Between the duration of sleep and pulmonary fibrosis - a disease in which scars that violate the function of respiration appear on the organs. This conclusion was made by British scientists, reports Medicalxpress. The optimal duration of sleep for a person is seven hours a day. Deviation from the norm can increase the risks of developing diseases. People who regularly sleep four hours or less per day double their chance of contracting pulmonary fibrosis. At the same time, those who sleep 11 hours a day or longer triple it. Five thousand Britons die from this disease every year - as much as from leukemia. Smaller but still higher risks were also seen in people who like to go to bed late at night, or those who work in shifts. It was previously reported that daytime sleep can be deadly.. In addition, it became known that the use of even a little light during sleep can lead to the development of deadly heart disease and stroke.. News from Telegram. Subscribe to our channel https: // t. me / korrespondentnet Author: 1.