I know where the birds sleep

Yes, I found out where birds sleep. While walking through the Liberties on my way to college, I looked up and saw a very crowded tiny roof lined with sleeping birds. It warmed my heart that they all picked one roof out of about 10 attached roofs. Roofs or rooves? I had to look up 'roof' in the dictionary there to check it was an actual word as it occurred to me that it sounds very strange. roof.