I've found on every A380 LAX-LHR flight I've ever taken, every shade is down until 3pm or whenever it arrives back in London, which could well have had 9hrs or daylight at that time.
If I'm not in a window seat, the first thing i know of anything outside is the thud when we land.

People do want to sleep unail 2-pm, and then not be able to sleep back on UK time.

787s, the crew always seem to dim the windows, so you've that purple tinge for most of the flight.