It can't be proved Jack, because it is presently beyond science.

But it does happen.....why should anyone lie.
My experience was verified by my wife because I told her almost exactly what was happening, at almost exactly the time it happened and it involved the tragic death of someone very close to me.
In fact two people, one killed and the other subjected to an extended period of terror and emotional stress.

I put it down to primitive senses, others may say it is supernatural.