The 114 is a nice late flight.
Unfortunately I understand from other posters on this site (paging
LeisureFirst!

) that food in the lounge is quite poor.
What I would do is have a nice solid lunch in NYC that will keep me going through the day and then take some ham, salami and a few salad leaves to JFK with me to eat before I get on the plane.
I would sleep all the way through the flight, not bother with breakfast and only put the seat up when the fasten seatbelt sign comes on.