Missing...

Alice sat looking at the clock on the wall... how sad she felt for it... gazing at the twelve numbers spread evenly around the clock face, and wondered to herself which would be missing when we woke the next morning.... she at first decided that she would try to stay awake all night, but she knew that at some point she would fall to sleep, and an hour would go missing...  all she could do was appreciate all twelve number for the rest of the day...