Harbin Medical University (China) researchers have concluded that a person, who sleeps early have healthier and fitter sperms and on the other hand, men who went to bed after midnight had lower sperm counts and their sperm died much sooner too. Sleeping for six hours or less made this even worse, as did lying in bed for more than nine hours.
Previous study revealed that as compared to men snoozing a full eight hours, men getting six hours a night had sperm counts that were 25% lower.
Late bedtimes increase levels of anti-sperm antibody
According to the study – Published in the journal Medical Science Monitor – those fall asleep between 8 and 10 pm, have the best sperm motility, meaning they have a greater chance of fertilising an egg as sperm are better swimmers. Late bedtimes and inadequate rest increase levels of anti-sperm antibody — a type of protein produced by the immune system which can destroy healthy sperm.
To check sperm count scientists took regular semen samples
For the study, the researchers monitored sleeping patterns in 981 healthy men instructed to go to bed between 8 pm and 10 pm, between 10 pm and midnight, or after midnight. They were also asked to set their alarms so they got six hours’ sleep or less, seven to eight hours, or nine hours or longer. To check sperm count, shape and motility, scientists took regular semen samples.