A boy sleeps on a car ride.
A boy rest in a car
Rest can be not when awake, not just when sleeps.
exists e1 x1 x2 x3.(on(e1,x2) & n_ride(x2) & of(x2,x3) & n_car(x3) & Actor(e1,x1) & v_sleep(e1) & n_boy(x1))
exists x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_car(x3) & n_rest(x1) & of(x1,x2) & n_boy(x2))