tldr; How do I separate creative inspiration from mania?

I make music as a hobby, and I've noticed that a lot of my "inspiration" periods have to do with being manic. When I'm manic, it seems that I can come up with a million different ideas, and they all sound amazing to me.

However, when I'm no longer manic, those same ideas don't sound so good anymore.

I think overall, I've come to recognise that manic creativity is actually not very useful. For example, it's like I can only work on a single idea when I'm manic for a small period of a time (since the mania will wear off), so it's like I allow myself only a few hours to write a song, because after that, it's like that song is no longer so interesting for me.

But naturally, music takes days, even weeks to fine-tune and perfect (especially from a production point of view), and it's like I just don't have that attention span, because the mania cannot sustain itself.

It's interesting, because early on I simply thought it meant that I needed to figure out how to get my ideas down quicker, and be able to write my songs quicker. But I now recognise that the mania is the problem, not my workflow itself.

Anyway, I was looking for some advice on how you manage creativity without relying on mania? Like, I'm just a bit lost on how I should go about it, or even what it would mean.