Optimize is right. Medications can cause that, lack of sleep (maybe even sleeping too much). I understand what you mean, though, because I was diagnosed with ADD, and I'm thinking of talking to my pdoc about going back on Adderall, because I didn't give it a fair try the first time. I read, but I tend to re-read stuff because I don't "absorb" it the first (or second, or third) time around. It usually takes me a week or so to finish a novel, when it used to take me three or four days. But I also don't read every day or night like I used to.