Coffee makers are one more thing to maintain, clean (!), replace -- they'd be happy to bring you coffee at the time you specify in the morning. Just hang the room service breakfast menu on your door before bed.
(Also, not trying to talk you into breakfast, but studies show people who eat breakfast lose more weight when they are dieting. Of course, those people don't sample everything on a cruise ship buffet, but a little fruit and some eggs will tide you over to lunch, which can then be smaller.)