You've heard the warning before: "Don’t go outside with wet hair, or you’ll catch a cold!" But how much truth is there to this advice? Is stepping out into the cold with damp hair actually dangerous, ...

Add Yahoo as a preferred source to see more of our stories on Google. Sleeping with wet hair can be convenient, especially if you have a busy schedule and don’t have time to dry your hair before bed.

You finish showering late, too tired to dry your hair properly, and collapse into bed with it still damp. This seems harmless. Your hair dries eventually, right? Unfortunately, those hours of dampness ...