DS1 has gone on school trip to US today (it's "Politics" so they get UN, Congress, Arlington & Q&A at the NRA as well as Hard Rock Cafe, Bloomingdales and the Statue of Liberty). He was up at 5am - the flight was at 10am - they landed about 1pm NY time (6pm our time) and spent the afternoon in Central Park. They have a trip up the Empire State Building booked at 2am our time so probably won't get to bed until about 24 hours after they got up.