For what it's worth I've only seldomly seen reach-big7 playing before 9 PM and after 3am Sydney time .
Rarely after 1.30-2.00am Sydney time ,mostly between 10pm & 1am Sydney time.

There is some brinkmanship going down .

http://en.wikipedia.org/wiki/Brinkmanship

If it serves a purpose ,and if some are fool enough to fall for it, Mea Culpa.