Add Yahoo as a preferred source to see more of our stories on Google. Man tucking a freshly cleaned pillow inside of a clean white pillowcase. - Olya Detry/Shutterstock When you wake up to blood on ...

When you wake up to blood on your pillow, you'll obviously want to figure out how it got there. Maybe it's from a minor problem like a nosebleed (which might be a sign that it's time for a humidifier) ...