Night Sweats Treatment - While having night sweats and hot flashes causes distress for most of us, it is a natural symptom of perimenopause You may begin experiencing hot flashes and night sweats in your 40's or as early as your 30's. A woman's menstrual circle stops when she attains a certain age. This usually happens when she is in her late forties or early fifties. Perimenopause symptoms like hot flashes are usually noticed several years before the end of menopause. The symptoms that are experienced during this time are largely due to an erratic supply of estrogen.