Saturday’s “NHK Special” reported on a steep drop in sperm motility among Japanese men and examined the factors behind growing infertility in Japan. Japanese men’s sperm is reportedly deteriorating in count, motility, and morphology. In addition to the effects of chemical agents, several daily habits appear to be responsible, such as excessive intake of saturated fat, lack of sleep, and sitting for long periods. The program claimed that rectifying such habits is important for improving sperm quality. For instance, sleeping for extended periods increases testosterone, which plays a key role in improving sperm motility.