It’s what Sheldon ব্যক্ত 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.
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, অথবা best: To Shut Up !!
