Having trouble falling asleep? Waking up several times during the night? Feeling foggy-headed all day? Hormonal changes associated with perimenopause and menopause may be the culprit.

Menopause brings radical changes to your life—the most talked about being hot flashes and weight gain. But you may not realize how much menopause can affect your sleep patterns.

To help you get the rest you need, we've compiled answers to many of the questions asked by the 40 percent to 60 percent of menopausal women who report experiencing sleep disturbances.

How does menopause affect sleep?

It's all about estrogen, the "women's hormone." Produced in the ovaries, estrogen plays a vital role in regulating a woman's metabolism and body weight and in processes at every stage of sexual development and childbearing. During perimenopause and menopause, estrogen production steadily diminishes, causing myriad symptoms—many of which directly or indirectly cause sleep disturbances.