My kid loves the Imperial March too for some reason. I thought I was a bad parent. Strange we came to the same conclusion. There must be something to this. /s (n=2)
This was my first reaction as well. Paternity leave is not what I'd call an opportunity for deep thoughts and pondering. He must have had a very good baby!
When my son was born, I spent most of the wee hours testing which Star Wars theme I hummed worked best for getting him back to sleep.
(By the way, The Imperial March worked best, especially slowed down and rocking him on every 4th beat)