the japanese coffee

We are in front of a bar, one of those bars that are so talked about in Japanese books, one of those bars where it is easy to take a breath and rest... There is one man in particular... or rather, he is a boy, he is about fourteen years old. The boy enters the bar and says: "A coffee please". The bartender looks at him and says: "but you look tired, when are you going to sleep?" Then the boy looks at him with an exhausted face and answers: "I go to sleep early, but what is around me and inside me does not let me sleep"