American Journal of Epidemiology (2013) DOI: 10.1093/aje/kws420
Sleep disturbances may undermine semen quality. In a study of 953 Danish men who completed a four-question survey about sleep patterns during the previous four weeks, researchers categorised responses to each question as: 'all the time' (scoring 100 per cent); 'a large part of the time' ( 67 per cent); 'rarely' (33 per cent); and 'never' ( 0 per cent). The sleep score was the mean of the pe
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