F is still Dine on Demand, right? So on ZRH-SIN I could have dinner at the First Class Lounge, then on the plane go right to sleep, have breakfast after 6-7h flight time and then have the main meal as lunch 2h before landing?

Because this would make a lot more sense to me in terms of jetlag avoidance and sleep quality, or at least definitely more than having a huge dinner after midnight and then breakfast at 17:00 Singapore time.