Hey was I thinking, Is it possible that the cabin of MH370 lost oxygen without explosive decompression? Possible system malfunction? Maybe they were having electronic system malfunctions and started pulling buses and changed course for closest viable aerodrome but become overcome by hypoxia from a pressure system malfunction? This could explain the "okay, goodnight" message and later mumbled communication to japan airways from F/o as Hypoxia can do very strange things to brain. Any thoughts?