500
"Then their mouths come open and their heads start bouncing up and down like they're bobbing in a big tub of water for apples and before you know it, ... woop, zoop, sloop ... they're out cold and their face thunks down smack-dab on the book." (Paragraph 4)
Identify the simile in the above sentence and explain what it means in the context of this selection.
"Bouncing up and down like they're bobbing in a big tub of water for apples..."
Shows how people fall asleep in the library