- Sleep's effect on the body's hormonal system - implying that a lack of sleep could hinder regular ovulation.
- Sleep deprivation's effect on leptin levels, which can also have an impact on ovulation.
- Insomniacs' higher levels of cortisol and adrenocorticotropic, both of which can suppress healthy cycles.
He quotes this article by Toni Parker that discusses research performed in Boston on women athletes who were given leptin to help resume their menstrual cycles and restore ovarian function. (There's a movie clip and several tips on how to sleep better there too.)
And while I find all of these studies interesting - and their advice good to follow, just for general good health - I think it's still important to say that a lot of cases of infertility can't be solved simply by getting a better night's sleep - on the other hand, you really have nothing to lose...