Since this is a pilot health forum, I had to throw .02 in. Few of the recommendations by British Airways will work for international flight crews because of rolling schedules, eat when you can and continuing time zone changes. They may be ok for passengers in back snoozing away. Until you have started that descent into the typhoon at 6pm local Asia time with your body clock at 4am back home you cannot understand dealing with fatigue/ jet lag. (Hooray for coffee and adrenaline.)Sleep when tired and with luck you will be in a hotel room. Sleeping through the night the first night back home after a week of asia flying works well. THEN you start waking up at 2am the second or third night.....I've found that ambien works wonderfully the second night and helps snap the body clock back to home time. (Only once or twice per month tho) It IS FAA approved with a min of 24hrs before the next flight.