Name of this scary childrens' book???

[Xerus]

Does anyone know the name of this scary children's book? I remember it back in kindergarten, but I can't remember the title. Two boys decide to sneak out of their parents' house at night and sleep in the alley for some reason. And they bring a lot of junk food with them too. But then they both have nightmares about a green garbage can monster coming along eating garbage cans in the alleys and then eating up the boys too. So they rush back into the safety of their rooms to sleep. If anyone has heard of this story and knows the title of it, please let me know.