The scientists have recently discovered that it is unhealthy and even dangerous to sleep for 9 hours or even more every night. As it turns out, prolonged sleep increases stroke risks for those women who already had menopause. 93 thousand women across US participated in the study. Only 5% of the women aged 79 reported to sleep 9 hours or more every night. The results of the study showed that the stroke risk in those women exceeds the risk undergone by women who sleep 7 hours per night by 60-70%. Full story