It's not just aging that causes sleep problems for women; hormones are partly to blame.
According to research from the Rush University Medical Center, approximately 16 percent of postmenopausal women say they have trouble falling asleep. Forty-one percent report waking up several times during the night.
The study looked at women from several ethnic groups. Caucasians were more likely to have trouble staying asleep. Hispanic women were least likely to wake up repeatedly. Among Hispanic, Caucasian, African American and Japanese women, Chinese women were more likely to report waking up earlier than planned.