We have a morning flight out to SFO. Looking at coming to the airport the night before to a) save the cost of a hotel night and b) enjoy some of the amenities of the lounge (dinner, etc.) that we wouldn't with an early arrival for our morning flight.

Downsides of this? Are there areas to get good rest in? Or is it pretty much just couches that you're not supposed to lay down and sleep on? And is the complimentary food good enough to make this even worth considering, or will we be wishing for a real dinner somewhere?