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Sleep disturbances decrease the number of sperm.
In a study, published in the journal American Journal of Epidemiology, the researchers found that men with more sleep disorders had 29% lower sperm concentration than men without sleep problems.
In addition to the reduced number of sperm in their semen, men with sleep problems also had fewer morphologically normal sperm.
Sleep problems, along with being overweight, exposure to tobacco smoke and other pollutants, appear to be some of the factors that possibly influence male fertility.