WHY DO AIRLINES INSIST ON CLOSING THE BLINDS ON DAYLIGHT FLIGHTS?
This conundrum is proposed by T. Denham, but it's not universal.
Apart from take-off and landing, when raised shades are obligatory, some airlines request window shades down during daylight, but no airline has the right to require it.
Blinds closed is more likely to prevail on long sectors, especially on an overnight flight travelling in an easterly direction.
Darkness might last only four to five hours and closing the blinds beyond that timeframe makes it easier to sleep.
Even when we board a flight feeling perky, there might be others who have just transferred from a red-eye and need sleep.
A darkened cabin also makes it easier to watch your video screen. During mealtimes it is only reasonable to open the shades to see what you're doing, but shades down is democracy in action, the tyranny of the majority.