Remember that Simpsons episode "Home Sweet Homediddly-Dum-Doodily" where the Simpson kids have to go live with the Flanderseseses? There's this scene where Ned and Maud are tucking the children into bed and Bart and Lisa complain that it's too early for bed. They open the curtains of the bedroom and it turns out the sun is shining, people are mowing their lawns, and children are playing. (I would put the clip here, but there is a shocking lack of Simpsons clips on the internet.)
We have that experience on a daily basis now, thanks to near-16-hour days. If I'm not paying attention, we can easily accidentally let the kids stay outside playing until 8.30pm, at which point it's like "crap, gotta get them in bed NOW because there is school tomorrow." At 8.30pm, the sun is still going strong. Then, to help ease ourselves into bedtime, we have to close all the blackout curtains in the house. It helps induce nighttime, if an artificial one, but the illusion is broken if you forget and open the curtain for some reason. It's like being a vampire exposed to sudden sunlight - you squint your eyes and flinch and get those curtains closed back up asap.
We like to crack the window in our bedroom to keep it nice and cool. Last night I reached behind the curtain without drawing it aside (pro tip) to crack the window. There were literally birds chirping, like it was some kind of summer morning. Wrong cues for a restful bedtime. We closed it again and waited a couple of hours for the birds to go to bed.
And still almost two months to go until the longest day of the year!