TYRO
Yes, but some questions were raised about damaging windows and I meant to add a comment. These (automotive type) reflective blinds are commercially available to fit aircraft windows. They have not done any perminant damage to my knowledge but have resulted in more false window heat failures at the gate (usually cleared up with a bottle of cold water).
I guess the question is, if you had these blinds at your disposal in flight would you be inclined to use them?