Yes, in Truth Come to Light it's my Bipolar disorder and Borderline personality disorder. I included similar symptoms and experiences of my mania, depression and borderline mood swings. Also my knowledge of archaeological digs.
The hours are long, writing, researching and editing but if it's your passion you will enjoy every moment of it even when your neck is sore and your brain can't form another word.
Reading. I've always been an avid reader and my imagination overflows. I've been writing since I was a teenager so about ten years. A lot of my poems, short stories aren't published though.