We managed to enjoy several hours of sleep on our SFO-SYD flight and recleared security here without problems. A friendly flight attendant had given us a bottle of wine on our first flight. Since we had to clear security into the international area, since our short flight is on UA, we had to give the wine to the first nice young person we saw on her way out.
We're sitting in the quite lovely Air NZ Lounge for a few minutes before boarding. So far so good!