Sometimes changing the correlated item, also affects the cause, through a link of causual changes.
E.g.: "Night visits to the fridge linked to high cholesterol".
Now, that's just correlation: it's not the visiting of the fridge, it's the snacking.
But if you read that and stop visiting the fridge, you likely reduce your snacking too as a side effect, and thus lower your cholesterol, without consciously trying to address the primary cause.
Maybe it's because I don't see how sleep regularity is a factor you can change as willingly as visits to the fridge, or maybe its because I don't see why people wouldn't just eat more before heading to bed.
It could also just be that I find a treatment of symptoms to be less desirable than causes.
In some cases it might be hard (e.g. insomnia), in others it might be as easy as e.g. changing your schedule, or stopping binge-watching/gaming/doomscrolling late, or some such change.
>It could also just be that I find a treatment of symptoms to be less desirable than causes.
It is more opaque.
But the point is not that it's necessarily easy. It's rather than even if X -> Y is mere correlation, by forcing yourself to fix X (even if hard), the resulting changes might also help with Y.
And technically "bad sleep" here isn't necessarily a symptom either. It can be a co-effect of the same symptom.