Scientists have discovered that people who regularly sleep for more than 11 hours or less than 4 hours are more likely to have pulmonary fibrosis compared to those who sleep for 7 hours in a day.

The study also reveals that targeting the body clock reduces fibrosis in vitro, revealing a potential target for this incurable disease that kills about 5,000 people, a year in the U.K.,the same number as leukaemia.

The research team members are based at the Universities of Manchester, Oxford, Newcastle, University College London, and Toronto, as well as Manchester University NHS Foundation Trust.

The study is published in Proceedings of the National Academy of Sciences and is funded by the Medical Research Council, and the Wellcome Trust.