Originally Posted by
World_Traveller
Besides the window shades being open during take off and landing, SQ also has the cabin lights switched on or off depending on whether it is a day or night flight. This is also in the interest of safety.
I was told by a FA friend once that this is to help your eyes acclimate so that if it were a crash in darkness (in which case it would be likely the cabin lights would go out), you wouldn't waste time fumbling in the dark, you'd already be used to the darkness.
I also noticed on SQ recently that their safety video is very specific about keeping your shoes on during take-off/landing.