I've used the levo bookholder for years. It holds my book, iPad, or e-reader overhead so that I can lay back in bed or in my recliner and read without straining my hands, arms, shoulders, or neck. The company also makes a desk model that uses very little desk space and provides great flexibility for positioning a book; I use the desktop model, too.
Here's a link to their website: http://www.bookholder.com/i/21/levo-book-stand-floor-model.htm
Their products may also be available on amazon.com.