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Do you get enough sleep? Does your partner? Increasing demands of work may be shortening the duration of your sleep. So may increasing time on the screen with facebook, instagram or other forms of social media. An attempt to assess the affect of sleep on the ability of men to conceive was reported in the March 2018 issue of Fertility and Sterility. Authors Lauren Anne Wise et al from the Boston University School of Public Helath, conducted the study.
The authors report that the Institute of Medicine has estimated that 50-70 million adults in the US have chronic sleep and wakefulness disorders, that about a third of US adults report less than seven hours of sleep on average. Sleep deprivation has been correlated with obesity, cardiovascular disease and all cause mortality. The authors also reference a 2013 Danish study by TK Jensen et al in American Journal of Epidemiology which reported that sleep deprivation in a study of 953 men was associated with lower sperm counts, and morphology. Previous studies have also suggested that increasing sleep deprivation may also correlate with decreased testosterone levels.
Working on the hypothesis that quantity of sleep might affect male fertility the authors evaluated 1176 men who were partners in couples trying to conceive a pregnancy. The men were questioned at 8 week intervals regarding average duration of sleep and initiation of pregnancy. Quality of sleep was also explored. With respect to sleep duration, options included <5, 5, 6, 7, 8, 9 or >=10 hours a night.
Results showed 34% OF men reported 6 or fewer hours of sleep on average. Relative to couples where the male had 7-9 hours of sleep, chances of conception for 6 or fewer hours was about 62%. Sleep duration greater than 9 hours also seemed to have a negative effect, though the number of men in that range was low.
I generally advise my patients that sleep duration and quality can both affect fertility. Things that can affect sleep or sleep quality include caffeine, alcohol, use of tobacco, eating right before sleep, the environment for sleep and so on. It is interesting to note that the decreasing number of hours Americans are sleeping, also seem to correlate with a noted decrease in global sperm counts.
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