>"For the record… my garage is unfinished, so I can actually see all the studs, outer wall, and rafters."
At 180 pounds body weight and a 30 degree angle, the down force on each eye bolt is 90 pounds but the side force is 156 pounds. The joist/truss is strongest against down forces, but not so strong to the side, especially if it hasn't been sheathed by plywood or drywall.
So slide a 12-foot 2×4 up there and nail it off to the joists just above where you'll put your eyebolts into the joists. Then the joists won't get pulled sideways by the tension on the hammock ropes.
Or, since only compression is a possible issue, put blocking (14.5" or 22.5" lengths of 2×4 or 2×6) in a line between your two attach points.
Why are you sleeping in the garage? Did you forget to give your wife a Christmas present? Or you did get her a present but it was a washing machine or BP gear you wanted?