Human element is going to thwart your countermeasure when they want to let in some light.

Weighted curtains don't really help with sound dampening that much unless it's somewhat air tight. I shopped around a bit for window sound dampening products, them need to form seal around the window hole.

The word is "damping," not "dampening."

(I am willing to die on this hill.)

oh haha my bad, not that I can use ESL as an excuse anymore since I effectively use it more than my native.