A newborn baby sleeps in it's crib.
Nobody is sleeping.
If the baby is sleeping, then someone is sleeping - not "nobody"
exists p1 s1 x1 x2.(exists x3.((x1 = x3) & n_crib(x3)) & in(x1,x2) & n_thing(x2) & n_sleep(x1) & of(x1,x2) & n_baby(x2) & a_newborn(s1) & Theme(s1,x1))
-exists e1 x1.(Actor(e1,x1) & v_sleep(e1) & n_person(x1))