found this info and wanted to share
During the years leading up to the end of menstruation, your estrogen levels may begin to fluctuate erratically, causing a range of symptoms. Some, like mood swings, sleep disturbances, and weight gain, may just be part of the overall aging process. But unless you're one of the few women who experience none of the signs of hormonal change, you'll probably experience some of the more common listed below.
Changes in your periods. One of the first things many women notice is that their periods are no longer regular. You might bleed more or less than you have in the past, and your periods may be shorter or longer, heavier or lighter.
Hot flashes. Hot flashes are very common during perimenopause--two-thirds of women experience them. During a hot flash you have a sudden sensation of heat in your upper body or all over. Some women may sweat heavily, and then feel chills. Hot flashes can range from mild to severe, and can wake you from a sound sleep (these are called night sweats). Most women experience hot flashes for between three and five years before they taper off.
Vaginal and bladder problems. As your estrogen levels fall, the tissues in your genital area can become drier and thinner, leading to painful intercourse, vaginal or urinary infections, and problems holding urine.
Sex. Some women find that their feelings about sex change. You may be less interested. Or instead, you may feel freer and sexier after menopause.