Have you ever missed an important appointment because you have become so engrossed in a book you forgot the time or were up so late reading that you didn't wake up in time? Been late to work because you couldn't resist the temptation and left the house too late?
Have I ever? I'll even stay up and finish a book I don't like! In fact, I did that last night, reading The Song of the Lark and beginning to write it up. (Watch this space for a snark attack.) I could not go to bed until I'd finished The Woman in White, Savage Beauty, Member of the Wedding, The Great Gatsby (for the 80th time!), Brother Cadafel tales, The Thirteenth Tale (which also disappointed me) - so many books.
As for being late for work, however - no. There I draw the line. Were I to lose my job, how would I buy books?