We have blackout lined curtains, which don't let light through, but it comes round the edges. For that reason we also have the Gro Anywhere blackout blind that suckers to the window pains. This is excellent, and doesn't let in any light, but it also means we can't open the window.
DDs room is south-facing, and it was 24 degrees in there the other day, and it's only April. I'm afraid it's going to reach about 30 degrees in the summer if we can't open the window for ventilation! We tried a night without the Gro blind last night and she woke up at 4am and wouldn't go back to sleep.
Any suggestions?