Is the use of "だって” regional or is it used everywhere?


I recently came across "datte" for example: "だって眠くないんだもの" Is this specific to
a dialect or used all over Japan?




This [だって](https://dictionary.goo.ne.jp/word/%E3%81%A0%E3%81%A3%E3%81%A6/) is
a word recognized by dictionaries. It is a part of the Standard Japanese
vocabulary and safely understood in casual conversation without showing
peculiar color, if not everyone from every region uses it spontaneously.

