Excuse me, can you sleep with a book as a pillow and suck all your knowledge into your head? Otherwise, what's the moral? Please explain ... thank you.

It means that I hope that the knowledge in the book can be deeply imprinted in my mind, and I hope to dream of the story of downsizing and the recorded knowledge in the book. This meaning is still good, but from a medical point of view, pillows are too hard or too high, which is harmful to the blood circulation of the brain. So, let's accept this meaning, but don't ignore our health.