I say this with a pinch of salt, however, I found singing to my munchkin, when she was a baby, quite useful when I was trying to pacify her. Bed time was basically singing the following in this order, over and over again until the eyes close and she makes a weird sleepy snort: (there's a link for YouTube) 1. 媽媽好(in Mandarin - I don't speak Mandarin but I prefer this version than the Cantonese version) 2. Mary Poppins - Stay Awake 3. Moon River 4. A very incorrect/hybrid version of 月光光照地堂
The latter is a song my mother sung to me but I was never awake to hear it properly
Move on two and a half years and I introduced Mary Poppins and the scene for the song Stay Awake came on and instantly the munchkin got excited, turned to me and said "Mummy sings that!"