Daylight Saving

In Beijing daybreak is around 430am, but in MuDanJiang, 1200km to the northeast, daybreak is around 330am. Thats a bit too early for whichever part of my anatomy that regulates sleeping hours according to daylight. Across to the west in Xinjiang province, some 3500km away from Mudanjiang, I remember the locals set their clocks to 2 hours earlier than Beijing time, the standard bearer of time clock for the region, not just for China alone, but all the way to Singapore. Apparently China did try multi time zones in the 70's but country couldnt cope with the confusion. Worth any attempt now.