~snip~
The discussion here is getting weird. I had fun reading the posts. Sleeping in the graveyard is too much of a desperate move already. Why not sleep inside the coffin itself? They will surely be dreaming something.
Actually, it is not just in Asian countries where belief in mystical things exists. It is also present in other continents. I believe this thing even exists in some parts of Europe.
My only hope is that they will not win after doing all these weird things, or else they will interpret it as a proof that what they are doing is indeed effective. They will be reinforced to do it again instead of coming to their senses.
That is not a crazy idea because from what I heard, they always come to the graveyard and slept on a specific day. Their purposes are to get some of the revelations as you said. Some of them can hear some whisper that told a number, some of them can see a sign about the number. Many experiences from them but most of them are not share what they've got.
The old people who played traditionally gambling always did that to get the right number. But after that traditional gambling was prohibited, I don't hear some people are continuing to go to that place. Besides that, the generation of people after that old people don't want to follow them because they think that is ridiculous. They prefer to use the other method.