As he pulls up her colorful blankets and tucks his daughter Raegan in for bed, Retired Army 1st Sgt. Seth Kastle knows that tonight "bedtime" will be a little different.

Tonight, Seth will read his daughters "Why Is Dad So Mad?" — a book he wrote about himself.

Kastle served for 16 years in the Army Reserve, and was deployed to Qatar, Afghanistan, and Iraq. When he returned home to his wife and kids in Wakeeney, Kansas, he struggled with Post Traumatic Stress Disorder (PTSD) and had a hard time explaining it to his kids.

"I struggle with anger. That's probably my main symptom. I also have some issues that go with my memory," Kastle said. "There's mornings that you go into the bathroom and you look at the cup that holds your toothbrushes, and you just stare at it because you don't know which one is yours."

Kastle searched for resources to explain his PTSD to his children, but found the options lacking. So, he wrote a book and started a Kickstarter campaign to raise the funds to hire an illustrator and get the book published.

The book is available now at www.kastlebooks.com

To read the full article: http://www.nbcnews.com/nightly...ain-his-ptsd-n334271