The gooey or dry matter that collects in the corners of your eyes

The questions from the questionnaire below were apparently taken from Professor Bert Vaux's Dialect Survey. (Although it didn't ask his What do you call the gooey or dry matter that collects in the corners of your eyes, especially while you are sleeping?)

The Great Pop vs. Soda Controversy has a map and explanations, and another map is from the Conglomerate