Hypergraphia is all too real. I think I recorded writing through 30 pages in a journal in a day. I won't say for me personally it's a hard indicator because I do just like to write and play with thoughts and ideas, and I do have a habit of texting a gazillion people a lot if my attention-*****ness is uncontrollable (not related to mania), but there's just a specific nature of manic hypergraphia I'm not sure how to explain. I think it's that there's less of the enjoyment of the thought process or trying to communicate and more "I HAVE to get this down," or "I HAVE to get this out."