Melatonin receptors have been found in all male and female sexually responsive tissues, indicating that melatonin has a significant role in normal reproductive capacity. Exogenous melatonin can suppress the release of gonadotropin releasing hormone and lutenizing hormone, leading to anovulation and changes in steroid responsive tissues, especially in higher doses (link)
Abnormally high or pharmacologic concentrations of melatonin in women are associated with altered ovarian function and anovulation. It is believed that the hormone also has antigonadal or antiovulatory effects in humans, as it does in some seasonal and nonseasonal mammalian breeders. (link)
As much as I enjoy the better sleep, I may be getting just a bit too much melatonin, which is suppressing ovulation. So... not wanting an anovulatory cycle, I'm going to go with light for the next few nights... as much light as DH can stand!
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