You've heard it ~ put your nose in your books and get to work! If you haven't, it simply means it's time to do your school work or an alternate meaning could be - a person has a love for reading and never takes their nose out of their book. I hope story time with Nonnie was a precursor to a love for reading.
We were cracking up ~ Nathan wouldn't take his nose out of his Dr. Suess books! Too funny