As Stew47 points out, you may want to get on I-76 in Youngstown. In Fact, if you do NOT get on to the turnpike in Youngstown, I-80 will become I-76. No tolls, and runs you further south then I-80 does.
As for overnighting...there are two truck stop at the I-76/I-71 junction. Both have pretty good size lots, so you could probably hole up in the back of the lot with (EDIT: withOUT)TOO much noise.