Do you read more books at once?

Not sure if you are like me, but I almost never read one book at a time. Not sure why to be honest. I guess I find myself bored if the book is advancing too slow for my taste, or is being repeated from chapter to chapter, and I guess I just can't go without reading something in the mean time. At the moment I've got at least 3 books open, the biggest one being How to read a book by M. Adler. Still have to go an make some notes so that I don't forget what I like about it.