Book and Document Reader with PDF and DjVu support for comfortable reading.
It does what you expect it to do. You can easily lay down and read pdf books and documents with this app. 
The amazing enhancement dims your screen in some way that it doesn't hurt your eyes. 
Easy to set and keep scrolling. The best functional from all readers in this one.
Functional:
1) Read mode and control mode (single tap to switch)
2) Fixate pages by width, saved on scroll
3) Search in books 
4) Table of content
5) Night Mode
6) Search ALL books (PDF, DjVu) on device
7) Next Page or scroll pages by tap screen 
8) Full screen mode
9) Support e-reader keys like Nook, Kindle, Sony
10) File navigation
11) Recent Books
12) Light and black theme
13) Screen orientation: Portrait, Landscape, Automatic
14) Text Bookmarks for page
15) Links History, back to page
PRO Functional:
1) No Ads, No Internet permission
2) Support password protected PDF Files
3) Filter Search result
4) Sort search result by Name, Path, Size (Ascending, Descending)
5) Application screen brightness
6) Set custom keys for scroll next previous page