In Economy, I would eat in the Boston lounge. Then on board, get a drink or two and watch some entertainment or read while the noise and lights of the economy meal service goes on, trying to relax. When the lights go out, or if tired before then, recline seat, put on eye masks and earplugs, and attempt to rest. Good sleep will be impossible of course, but a light snooze might happen.

Wake up as close to arrival as possible, and get some portable breakfast in the landside M&S or the upstairs (departure landside) food places depending on timing and whether you got breakfast on the aircraft (and if you wanted to eat it!).