If you’re not getting the same amount of sleep every night and at the same time every night, you are at risk of metabolic syndrome, in which having three or more medical conditions (high blood pressure or triglycerides, low HDL (good) cholesterol, elevated blood sugar, and abdominal obesity), can increase your risk of heart disease, stroke, and type 2 diabetes. And the wider the variance, the higher your risk, according to a study published in the May 2019 issue of Diabetes Care.
Researchers reviewed data from the ongoing Multi-Ethnic Study of Atherosclerosis for 2,003 people who had worn sleep-tracking wrist bands for a week between 2010 and 2013. That information was cross-referenced against other health factors from a follow-up exam conducted between 2016 and 2017, including centralized obesity, high blood pressure, and low HDL cholesterol. Every one-hour increase in sleep duration variance resulted in a 27 percent higher risk of metabolic syndrome. Every one-hour increase in timing variance resulted in 23 percent higher odds.
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