Funny you should ask. I was hammering away last night on the latestbook in my series and was working up a sweat. I was hot, while my daughter was freezing in the same room. Thought i was sick and finally took a break... And cooled down. It was all the intense concentration- like playing a video game for too many hours. I've done all night sessions before where i typed until my wrists hurt. Can get physically exhausting sometimes. Sure wish i could just write a few hours a day, but i end up having to jam it all in oin the weekends.
The answers are in my new essay. Please let me know what you think.
http://bit.ly/158pTBH
Have fun.
Gamal