I'm guessing you have LED fans in your case... Those lights don't go out until the LED's go bad. Nothing you can do that I know of about that.
All of my fans run on my fan controller. I can't turn the fans off, but you can turn them down really low when you sleep to lower the noise a bit. I have
this one. It has LED's that surround the knobs that never turn off so I doubt you'd want something like that.
You don't want your fans to turn off dude