You can just bring or buy some pop-up travel blackout blinds made for babies. We used those with great effect when visiting my parents' summer house in Northern

You can just bring or buy some pop-up travel blackout blinds made for babies. We used those with great effect when visiting my parents' summer house in Northern Norway in the summers when the kids were young. Bonus, they now work as great blackouts in my home office for video calls when I do not want sunshine and clouds to change my green-screen effects etc.