iternabe
I'm of a different mindset on this.
When discouraged and not wanting to play, forcing myself to sit down and play isn't the solution to the problem. It may work for some but it's a guaranteed non starter for me.
I also think this might be more viable for those who have teachers than for those of us who self study. After all, you're paying for the lessons and not being prepared is a waste of money and everyone's time so you should at least try to do something between lessons even if just 2 minutes of scales.
The solution for this, and it happens in every hobby, is to somehow get re-engaged with your peer group. For music lessons with more than 1 student; a small impromptu get together/party/field trip/something might work to get minds active and excited again. But, for solo/self study students this is harder to do because often there's little time and usually no one to enjoy the break with other than spousal units who, let's face it, are really just the cheering section.