Does anyone get really bad night sweats occasionally and knows what causes it? I used to get them regularly with levothyroxine but fewer on NDT. Last night was awful, had to change nightdress as I was soaked. I ate late so failed to take my NDT till the early hours. I have had a total hysterectomy 3 years ago, on low dose hrt estrogen patches and cannot do without hrt as my hot flashes are awful when I stop.