Do you find reading makes you sleepy or do you get too into the book and not want to put it down?

My answer is both. I am not habitual to read novels. This is my 2nd book title is 'Siddhartha' by Hermann Hasse.
I put my self target to read the book fast without any interrupt. I have a problem of easy to loose concentration. This make me to be into the book. The book is also so intresting that I want to know what happened next. But because this is my first time I feel sleepy when I reach to 5th page also my speed of reading goes down.