First, great progress!!!
When you get too close to the morning let say after 04. Then the morning hours are sensitive, the child has slept enough so they feel like it is morning. Then if too much happens, the fact is there, morning has come, correct? At night when they wake up, their questions are different. So WHAT is the question, and then you have the answer accordingly.
A reminder jingle has the tone like you remind someone that it is still night, remember? The enlightening jingle announces that the morning is not here yet, go back to sleep. More like an order. It is not different jingles in words, It is the tone you use. Like happy, ordering, angry, peppy, confident. So you use your tone to give the answer you believe your child is asking.
So if he wakes up not sad but talking, you use the enlightening jingle, telling him it is still night, or a reminder jingle that it is still night. If he is upset you give a confident happy pepping jingle saying go back to sleep. Often this is longer like X6 or X8 if necessary to make him listen. Just don’t get stuck after 04 in the morning, then you turn the music on. You need to take a step back so that your son can keep doing progress. Do less, and less. And have confidence he can do more. Trust! Faith!