It is a mystery since no-one can be really sure. Hamlet put it rather well:
"To die, to sleep--
To sleep--perchance to dream: ay, there's the rub,
For in that sleep of death what dreams may come
When we have shuffled off this mortal coil,
Must give us pause. There's the respect
That makes calamity of so long a life"
"The undiscovered country, from whose bourn
No traveller returns, puzzles the will,
And makes us rather bear those ills we have
Than fly to others that we know not of?"
I guess I will find out, some time in the not to distant future.. Meantime, try to enjoy life while it lasts...