No wonder they are tired in the morning

Noah and Lukas are veracious readers and we are frequent visitors to the library, always on a quest to find something new to read. There are times when we have not even arrived back at the house and a book is read. If it was not for the library, I am not sure how we could keep these two in books.
At night, both happily curl up in their beds with a 'good' book. If the book is too good to put down, it is possible that we see a glimmer of light under the door opening late into the evening. Who can blame them? If the book is good, why sleep, when there is sleeping in next morning... so our entire family is shifting schedule, slower, later mornings and a bit later still slow evenings.