A group stands on tan checkered tiles.
The group sleeps on the ceiling.
One can't sleep while standing.  Ceiling do not generally have tiles.
exists e1 s1 s2 x1 x2.(on(e1,x2) & n_tile(x2) & a_checkered(s2) & Theme(s2,x2) & a_tan(s1) & Theme(s1,x2) & Actor(e1,x1) & v_stand(e1) & n_group(x1))
exists e1 x1 x2.(n_ceiling(x2) & n_group(x1) & on(e1,x2) & Actor(e1,x1) & v_sleep(e1))