Sleepy Songs in Hong Kong

So it's 1:34 AM and I'd really like to go to bed, I would. However, the man who sleeps next to me in our extremely crowded hostel (essentially 6 bunk beds in a very short and narrow hallway) has begun to sing in his sleep. At first I thought he was still awake and just lightly humming himself to sleep. I soon realized however that no, he is not awake, he is in fact asleep and he is singing. It also seems to be getting gradually louder. Oh the characters one meets.