When viewing documents hands free in Acrobat I find that by the time I really get a good rhythm going the book is finished. Here is a way to combine multiple files into one pdf so you can go for longer and develop an even more relaxed state while photoreading:
http://www.adobe.com/designcenter/video_workshop/html/vid0102.html

Thanks for the link. I love it when people actually try out their ideas.

AlexK

Hi thanks for sharing.
I think this is paid version.
You can also try pdfsam software.
Its freely available and can be used to split and merge pdf files.

Ganesh