Is it true that if you talk in a low vioce while a women is sleeping, you won't wake her?

It’s what Sheldon said about evolution making women sensitive to high-pitched sounds. Lower sounds are just less likely to rouse a woman out of a sleep. It was probably exaggerated on the show, since they weren’t exactly whispering, but to some extent it would work.

I don't know for sure, but most of the stuff they put on the show is pretty accurate, and it makes sense.

Good question. I don't know, I only know that if I want not to wake up my mother when I'm doing something wrong, I have to be silent and quiet, or best: To Shut Up !!