Earlier quoted context omitted.
In Germany you can generally call the city office and complain and they will put some metal there to block the light from falling into your house. It might be an option in other locations as well.
Don't houses in Germany, and western Europe, have blinds ? I only had this night light issue when living in the US
(Plus, the major temperature control move in summer Germany is to open everything possible at night and close it during the day. If you have mostly cool nights and good insulation that is sufficient.)