Originally Posted by BearX220

Serious answer:

If you are coming in on Delta, you can walk under cover to the Logan Airport Hilton. There is a heated enclosed sky-walkway from Terminal A over to the central parking garage, and another shorter one from the garage to the Hilton.

When you enter the Hilton you do so on an upper floor dominated by meeting rooms. If you were checking in, you'd walk past all that and find a down escalator to the lower lobby. But if you stay up there you will find warm, quiet places where you can most likely camp. I would not make a big show of sprawling out and going to sleep, but if you sit down and nod off I don't think anyone will find you.