Since no one has ever yet returned to life with an account of what happened after death, the sensible conclusion is, nothing..!! But as a matter of fact, those with a Christian belief that doesn't get entirely corroded and destroyed by the scepticism of the world in general know that Jesus himself raised three different people from the dead in the course of his short ministry, in order to prove the reality of God's power in that direction. And thinking people might then sensibly ask themselves "Why didn't those people who came back give a full account of where they went and what they saw, so that it could be written down and remembered for future generations ?" And the only possible reliable answer would be, because they actually remembered absolutely nothing of their own death - because death is exactly what Jesus himself said it is - a deep sleep, from which all those sleeping, safe in God's eternal memory, are eventually going to be awakened. This is the simple reality of what the Bible actually teaches - without the misunderstandings, corruptions and outright lies of generations of church "fathers", and all their hangers-on.