A study in Diabetes Care showed that adults with prediabetes or newly diagnosed and untreated type 2 diabetes who had between seven and eight hours of sleep per night had a statistically significantly lower A1C level, compared with those who slept for less than five hours or more than eight hours each night. Researchers evaluated 962 individuals, mean age of 52.2, and found a 0.79 mg/dL increase in fasting plasma glucose and a 0.3 kg/m2 reduction in body mass index for every additional one hour of sleep.
Study links sleep duration to A1C levels in prediabetes, diabetes
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