Most of the stuff I see concerns how to insulate the ceiling of the attic. My attic floor is insulated but the ceiling is uninsulated. I am thinking about leaving the ceiling alone to allow air flow, but I'm wondering if I should insulate the side wall.

Attic is not living space, just storage.

Bedrooms are below the attic.

I am in NY, north of NYC. Winter temps get down to 20's typically.

Attic has typical ridge and soffit vents.

The attic is about 9 ft high at the peak. down to 1 ft at the sides.

Side wall faces east.

I already have the insulation (bought years ago), and trying to figure out what to do with it.

Any reason not to do it, or am I just wasting my time?

Thanks,
Al