A man and a woman are sleeping while sitting in a bus or train of some kind.
A couple of people staying up late.
Staying up implies that the couple is awake not sleeping.
exists e1 e2 x1 x2 x3 x4 x5.(while(e1,e2) & in(e2,x4) & of(x4,x5) & n_kind(x5) & (n_bus(x4) | n_train(x4)) & Actor(e2,x1) & v_sit(e2) & Actor(e1,x1) & v_sleep(e1) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & a_late(s2) & Manner(e1,s2) & a_up(s1) & Manner(e1,s1) & Actor(e1,x3) & v_stay(e1) & (x1 = x3) & of(x1,x2) & n_people(x2) & n_couple(x1))