Sleepy subway passengers.
some tired people on the subway.
One gets sleepy when one is tired. Passengers and people are synonyms.
exists s1 s2 x1 x2.(n_passenger(x1) & a_.(s2) & Theme(s2,x1) & of(x1,x2) & n_subway(x2) & a_sleepy(s1) & Theme(s1,x1) & a_topic(x1))
exists s1 x1 x2.(n_subway(x2) & a_topic(x1) & on(x1,x2) & n_people(x1) & a_tired(s1) & Theme(s1,x1))