Here’s another study linking polycystic ovary syndrome (PCOS) and obstructive sleep apnea. Researchers found that obese women with PCOS had twice the risk of having pre-diabetes compared with women with PCOS but without obstructive sleep apnea. The important figure in this study is the fact that almost one-half (48%) of women with PCOS had obstructive sleep apnea, and even in the control group (obese women without sleep apnea), 36% were found to have obstructive sleep apnea. We know that sleep apnea can wreak havoc on your hormones and also promote weight gain. Based on these figures, it makes sense to routinely screen for obstructive sleep apnea in all women with PCOS.