Don't remember any nighttime departures from the USA to UK. Thing is Concorde took barely 3 hours to cross, sometimes in the 2 hours 50 something minutes bracket. Cabin pressure was much nearer sea level than subsonic cabins, humidity was much nearer normal levels so one emerged elated at having flown at Mach 2+, near 60,000 feet and full of good food and wine! The red-eye factor just never happened whatever time one flew East in the finest passenger aircraft ever to fly - so far! The Washington - Dulles International Airport Mobile Lounge system was the greatest blast. You checked in and sat in the departure lounge, the announcement that departure was commencing meant that the entire Lounge lowered [scissor lift] down and drove out to the Concorde. Driven by FAA licensed pilot/drivers. What a blast!
http://en.wikipedia.org/wiki/Washing...tional_Airport Find Mobile Lounge section
Eero Saarinen was the Architect