Ah, well, this might be something a little different from what I was commenting on (because our friend @Psimindset didn’t mention a change as you’re mentioning for you).
You may be right. You might have brought in too much Jing for you, at this time. The way I’ve been taught (which is the lens through which I look at this topic) the 3 Treasures are part of Ancient Chinese Medicine (ACM–a little different from TCM, in my book). I was taught that management of our Treasures is a key of life for each of us (and, when we get it wrong, then our ACM). Without boring you, it’s essentially like Goldilocks. You don’t want to have too much and you don’t want to have too little. You want your balance of your Treasures to be “just right,” for you (because everyone has a different balance).
So, yeah, you might have loaded up on too much Jing for you, which rather than energizing you (as you might expect from some of the reports in this thread) it can make you heavy/groggy, because you’re become out of balance for you. (It’s kind of like Yin/Yang, the extreme of one leads to the seed of the other.)
That’s one explanation. (And I’m sure you’ve played around with how you can best deal with that for you.)
Another explanation might be that you’ve become even more energy sensitive, so that “before” you would listen to this 6-7 times a day without noticing a change (what we usually call “feeling fine”), even though there was the changes were going on (as evidenced by the changes in your listening experience).
If this is the case (and wouldn’t that be nice if it is?) then you’re noticing the changes that were/are going on at earlier, more subtle stages, so that you don’t need to push yourself to listen to this field as much to get the effect that you want. (Good for you!)
Modern life (particularly in “the West”) is very hard on Jing. I see so many people who have Jing burnout (even in little kids, which shocks me) and I get to work with some of them. If we were having this conversation in a professional sense (and that’s not what I’m doing here), I probably would be–without any judgment–very interested in what drew you to this particular field. I would be interested in that because it’s a common thing for us to be aware when we’re burning our Jing hard and fast (and–let’s be honest here–burning our Jing hard and fast can be kind of fun sometimes)–we feel that going on for ourselves, so we get the idea to top up the Jing that we’re depleting. (Kind of like we do with our cars, when they’re running out of gas.)
If this is you (welcome to the “Western” world–haha) then you’re smart. In your desire to top up your tank, you reached for this field (as opposed to those who reach for something like–say–cocaine) to help you out. You reached for a helpful, positive tool (rather than something that would make things worse for you). Good for you.
Edited for fine-tuning.