Somebody once told me that he could train himself to read a book or rather feel a book by simply flashing each page in front of him subliminaly almost. This is supposed to accelerate learning in this regard. As you become intuitive to the material.
I considered that this might have meant that for some of us there is a homunculus capabale of processing text at an incredible rate but existing only in our unconcious mind. Aparently this theory does have credence and would explain our apetite for reading....
A more traditional approach woud be to use simulated rain or the sound of a waterfall and maybe some bird's chirping in background. I live in a city so when this is possible is when I leave the water on or at about 4 or 5 in the morning - the best time.
" I read best in a tent on a mountain undisturbed except by the howling wind, oh with my
dog, prefer in a storm but not too much of one!"