Episodes of intense sweating during sleep — often severe enough to wake you and drench your bedding. They are the nocturnal version of hot flushes and one of the most disruptive symptoms of menopause. Many women describe waking suddenly, feeling intensely hot, then quickly becoming cold and struggling to get back to sleep. Over time, broken sleep affects everything — energy, concentration, mood and the ability to cope. If this sounds familiar, you are far from alone.