  Using the action describing N coincident gravitational waves in M-theory we
construct a pp-wave Matrix model cointaning a fuzzy 5-sphere giant graviton
solution. This fuzzy 5-sphere is constructed as a U(1) fibration over a fuzzy
$CP^2$, and has the correct dependence of the radius with the light-cone
momentum, $r^4\sim p^+$, to approach the 5-sphere giant graviton solution of
Mc.Greevy et al in the large N limit.
