ATHEISTS, how do you explain this?

You may say visions of Heaven and God are hallucinations and you may denounce everything that might mean their is an afterlife, but how do you explain beyond and back experiences where people that leave there bodies are able to tell in exact detail what others are doing while their body is completely lifeless. Also when they witness Heaven (that you say is mythical) they describe people they never met before and even claim to meet miscarried children of a familiar family even though they were never told about him/her. Enlighten me please. One Source: a book called Heaven is for Real