Thank you Warsaw Will for giving a well referenced answer. I too had the same concern while creating poetic verses of humble nature. 'And so' comes naturally while writing emotionally, and grammatical rules kill emotions and creativity.

A simple example of your mind knowing when you are right is the decision that the second of the following two sentences is write, though both are senseless:
1. Well sleep green sentences.
2. Green sentences sleep well.

PS. Please do not correct my grammar.