You are reading a book and find that beyond a point, you can't concentrate? Here is a quick tip, cup your face with your hands in such a manner that your vision is restricted to just the book alone. Create a sort of tunnel vision in which you cannot see anything other than the page you are reading. This helps in focusing on the task on hand better, as this brings into your thought process under your command.

Please refer to the book for more details on this activity.