My elder son is 7.8 years old. He is in grade 2. He has developed lots of interest in writing. He loves to write any thing.. captions from movie.. any thing from Book.. any thing he get.. he writes so many pages in a day by himself. sometimes he writes for 1-2 hrs then we have to ask him to leave but still he don't want to leave. Is it normal kids behaviour or we need to concern and get it checked by doctor?