The thing about 4 am rain is that you can actually hear it, on trees and rooftops, with the expressway below mostly empty, night time motorcycle races cancelled due to inclement weather and a lull in the need for police ambulances and fire trucks. That is a rare and magical sound.
Of course L was waking up every 2 hours, last time at 4 and stayed up ever since refusing to go down again. Going to bed at 10 was a wise strategic move.