How do I “sound proof” a bedroom window?
From what I have read concerning soundproofing it primarily rests on if there is an airway for the offending sound to travel through. I was looking to soundproof a room for a drum kit and found this site very informative.
Even if you can’t do permanent construction, there are some possibly useful suggestions re. modified “second wall” solutions in the middle of this article and in here. And definitely listen to geeky if applicable.