@HatBeard
I'd recommend the blackout material from this place https://www.easyblindsonline.co.uk
They do easy to remove frame fastenings that shouldn't damage window frames https://www.easyblindsonline.co.uk/blinds/accessories/frame-fastener-strips-for-wooden-and-upvc-window-frames
Used them when our kid was a baby, I still use them for shift work in the summer
@sacredhart started
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@HatBeard
I'd recommend the blackout material from this place
https://www.easyblindsonline.co.uk
They do easy to remove frame fastenings that shouldn't damage window frames
https://www.easyblindsonline.co.uk/blinds/accessories/frame-fastener-strips-for-wooden-and-upvc-window-frames
Used them when our kid was a baby, I still use them for shift work in the summer