I have been reading quite a bit this summer and I have found that sometimes I hate picking out a new book. Even if I have dozens in my room stacked and waiting to be read. Even if I have books I know will be good.
I've realized that I have a hard time giving up my shared life with the characters I've been so invested in. I find it not fair, sometimes, that they get to go on living, but that I have to journey back to my world. And I get so used to those characters that I find myself not ready to get to know new characters right away. This is a problem because I am a chronic reader--I always have a book in my bag.
This is an issue reading shorter books as well: as soon as I get to know the characters pretty well, the story ends. And if it's still early enough before bed, I will want to keep reading, but sometimes it is simply impossible to pick up a new book with all the old characters on my mind still.
Sigh. Reading on summer vacation. It's a tough life.