I personally believe that there is life after death as well. I never had an NDE, nor would I make up a story of one. I also believe that the Bible has concrete evidence of life after death. Of course this is all based on a matter of faith and not scientific evidence.
For those quoting the " For the living know they are alive, but the dead knows nothing" scripture. That is probably one of the most overused scriptures by people claiming the ill-fated doctrine of "soul sleep."
Jesus did refer to Lazarus as "sleeping". Although, it never stated whether or not Lazarus's "spiritual" essence was somewhere else.
Jesus also told a parable about the Rich man and Lazarus. I believe that he was actually speaking on a real account, and not some made up story.
When Jesus died on the cross. His physical body was placed into the tomb, but what was Jesus doing for those three days? Soul sleeping until resurrection day? No. Jesus went and preached the good news to the "dead" and they were definitely aware of presence.
Here's scripture: 6 For, for this cause was the gospel preached also to the dead: that they might be judged indeed according to men, in the flesh; but may live according to God, in the Spirit." 1 Peter Chapter 4:6
Like I said, take this on a basis of faith in the Bible. If you're a naturalist then completely disregard my conundrum. I never believed in soul sleep, and I never will.