I don't know if it's specifically mornings, but I often have some specific section of a song stuck in my head.
I know there's been one that's popped up in my mind several times recently, but for some reason I can't remember what right now.
EDIT: This section right here!
(Go to 2:05)
I figured out how to get the link below to jump right to the specific time:
https://www.youtube.com/watch?time_c...&v=FxQ3NNE5Ug4