Immediately after an eastward flight, the circadian system will be running behind the local time zone. For example, after a flight from Los Angeles to London (8 h east), when it is time to get up at 07:00 in London, it is only 23:00 in Los Angeles, so the body clock will be ready for bed. To adjust to the new time zone, the circadian system has to advance, or shift forward, or move earlier.

The correct answer will depend on whether the crew is staying for 24 h or less or if they are staying for longer.

In the case of short stays, to reduce the effects of jetlag, the crew should keep things as they are by seeking bright light in the evening and keeping the curtains closed in the morning.

However, for longer stays, the crew should adapt to the new time zone as soon as as possible. Flying to the East, the duration of daylight is shorter, therefore the perceived daylight is shorter. Since the day is shorter, you'll have to go to bed earlier. Consequently, one should avoid bright light in the evening and seek bright light as early as possible in the morning.

Note: We have received consistent feedback which confirms the current correct option, despite the layover being given as 28 hours not 24.