Every morning I wake up with an "ear worm," which is a gross way of referring to a song playing in your head over and over again.
Same problem as you. I wonder if it's just another form of OCD but socially acceptable (as this handicap is mostly invisible)
Seems to be usual when music is big part of your life, but... Damned, thank goodness no one can get into my mind, it's such a cacophony.
It happens to me not only in the morning but also while trying to fall asleep, speaking with someone, doing something unrelated, like it's a background music following you all day long...
Interesting thing, most of these songs could be considered as messages from the subconscious, trying to give a key with their meaning... Or maybe is it just synchronicity ?