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09 Jun 2019

Irregular sleep patterns linked to metabolic disorders
BY Jane Kitchen

Individuals with greater variations in their bedtimes and in the hours they slept had a higher prevalence of metabolic problems

Individuals with greater variations in their bedtimes and in the hours they slept had a higher prevalence of metabolic problems
photo: Shutterstock/554782891

A new study has found that not sticking to a regular bedtime and wake up schedule – and getting different amounts of sleep each night – can put a person at higher risk for obesity, high cholesterol, hypertension, high blood sugar and other metabolic disorders.

In fact, for every hour of variability in time to bed and time asleep, a person may have up to a 27 per cent greater chance of experiencing a metabolic abnormality.

The results of the study, which was funded by the National Heart, Lung, and Blood Institute (NHLBI), part of the National Institutes of Health, appear today in the journal Diabetes Care.

"Many previous studies have shown the link between insufficient sleep and higher risk of obesity, diabetes, and other metabolic disorders," said study author Tianyi Huang, Sc.D., epidemiologist of the Channing Division of Network Medicine at Brigham and Women's Hospital, Boston. "But we didn't know much about the impact of irregular sleep, high day-to-day variability in sleep duration and timing. Our research shows that, even after considering the amount of sleep a person gets and other lifestyle factors, every one-hour night-to-night difference in the time to bed or the duration of a night's sleep multiplies the adverse metabolic effect."

For the current study, researchers followed 2,003 men and women, ages 45 to 84, participating in the NHLBI-funded Multi-Ethnic Study of Atherosclerosis (MESA). The participants were studied for a median of six years to find out the associations between sleep regularity and metabolic abnormalities.

Individuals with greater variations in their bedtimes and in the hours they slept had a higher prevalence of metabolic problems, and these associations persisted after adjusting for average sleep duration. This was also the case when they looked at the participants who developed metabolic disorders during the 6.3 years of follow up.

The prospective results showed that the variations in sleep duration and bedtimes preceded the development of metabolic dysfunction. According to the authors, this provides some evidence supporting a causal link between irregular sleep and metabolic dysfunction.

Increasing sleep duration or bedtime variability was strongly associated with multiple metabolic and simultaneous problems such as lower HDL cholesterol and higher waist circumference, blood pressure, total triglycerides, and fasting glucose.

"Our results suggest that maintaining a regular sleep schedule has beneficial metabolic effects," said study co-author Susan Redline, M.D., senior physician in the Division of Sleep and Circadian Disorders at Brigham and Women's Hospital. "This message may enrich current prevention strategies for metabolic disease that primarily focus on promoting sufficient sleep and other healthy lifestyles."




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