Hi: I’m a 49 y.o. male and when I started doing Bikram I had night sweats for over a month. I was told by more than one physician and natural path doctor that it was my thyroid. I also had body temp changes, cold when others were hot, and hot when others were cold. It took about a month and the night sweats went away and body temp adjusted, but if I miss going for a bit, it all happens again. It may take less or longer for each person, based on their thyroid or for women going through menopause issues a little longer. I’ve talked with many women who’ve said that once they started doing Bikram for a longer period that the menopause systems lessoned, and in some cases disappeared. (I’m in the supplement business, so I talk to many women and men about these issues.)