We have DTwins, age 3, and find it impossible to keep their room dark.
They are impossible. They make mischief with absolutely everything in their room, to the extent that internal wardrobe doors are screwed shut, and all furniture bar their beds and a screwed to the wall shelving unit, have had to be removed.
They need a very dark room to sleep well. They have two double windows, pretty standard sized, over which are black out curtains, which they swing on and pull down regularly. Even when up properly, the room is still very bright with the sun hitting their room directly and lighting up the edges of the curtains.
The opaque film you can apply to the window worked a treat, until they worked out if one gave the other a leg up, they could pick at a corner until there was enough to grab and rip it off. They did this every night until we gave up applying.
Blinds, they would just do the same, help each other reach it then pull on the bottom until it broke.
What can we do that will be completely fiddle proof please?