All spirit is matter - just more refined than what our knowledge or naked eye can see. That which is spirit is mature. It is the mortal coil that matures and not the spirit except in knowledge and intelligence. All creation upon death will enter the realm of spirits in their perfect matured state. It won't be until the times of resurrections when the perfected body and the perfect spirit will unite in an unseparable eternal state. In short, the spirit is every bit as real and the mortal clay.
I understand that refined magnetite becomes iron, refined bauxite becomes aluminum and refined crude oil becomes gasoline. But what the heck is refined matter? Neutronium? How is it refined - by nuclear reaction to remove electrons and protons?
When a person dies the physical body will turn back into dust and the spirit of man (or woman) sleeps until the Return of Jesus which is God' Day of judgement will come. It is even written in scripture that our spirit will live and not die if we believe in the resurrection of His Son, Jesus. Those who are alive in Christ at their death will be "taken up" first, at the Lord's Reappearing (1 Thessalonians 4:15-17)
Beetlejuice! A funny movie! The waiting room is to depict "limbo", I think... Some spirits are stuck on earth until they complete penatence and move to a more positive place we call Heaven. Or... depending upon your beliefs...
When you die all 5-letter words for ghost disappear from all the crosswords you ever solved in your lifetime - spooky. But if you decide you won't die, then of course, you will anyway because, what the hell, you're only human. And no matter what, when they send you on a mission you gotta go. Catch 22.
The good news is I can prove everything I've said by quoting from my Holy Book:
Catch 22, Chapter 3, pg. 38: "He had decided to live forever or die in the attempt, and his only mission each time he went up was to come down alive."