Night Milk

Do you know 'Night Milk'?
I heard about it on TV some years ago.
According to the TV program, if you drink a 'Night Milk', you can sleep very well. Because 'Night Milk' is milked from cow in midnight, there is much melatonin in the milk. Melatonin is an ingredient to sleep well. The TV program said it was very popular in Europe then.
After watching the TV, I wanted the milk very much. But I couldn't find the milk anywhere.
But, recently at last, I found the milk in supermarket !!
I bought it at once, and drank. Though I didn't know if it was effective or not because I drank only once, it tasted very good.
If you try it and feel its effect, please tell me!