Re: @Mikel
Of course it's a tidal effect. That's what LIGO measures, right? But not in an N-body system, but in a self-sustaining wave.
Assume for simplicity the energy in the gravitational wave is fully deposited in a body blocking its path with a surface of 1m² orthogonal to the radiation vector at 1 ly distance. How much energy is that? Should be easy to compute...