People who have repeatedly changing sleep and wake times and get different amounts of sleep each night are more likely to have metabolic health conditions. That is the finding of a new study. For years, lack of sleep has been linked to a wide collection of metabolic conditions, including obesity, high blood pressure, and diabetes. But until the recent study, health researchers did not know much about the effects of inconsistent sleep, including nightly changes in sleep amount and timing. Tianyi Huang is among the writers of the study. Huang is with the Brigham and Women’s Hospital and Harvard Medical School in Boston. In an email to Reuters News Agency, Huang said that more inconsistent sleep times are associated with higher metabolic disease risk. And that is “no matter if one has short or long sleep duration or has good or poor sleep quality.”