BKK tower is mainly staffed with females and they talk very very quietly.
Indian airspace is insanely busy, even at 2 in the morning.
FIR boundary crossings from Kolkata to Dhaka to Yangon are, ah, entertaining. You'd think for all the tech industry that comes out of that part of the world they would have kept some and applied it to their ATC system. At least you probably won't be routed via CHILA intersection on A599. There should be a note there, "Abandon hope all ye who fly over here."