I wanted to do some lucid dream research at my own, and mainly tro to learn more about paranormal phenomena.
This is my best idea, so far:

I had some déjà vu experiences before, but I haven't experienced déjà vu often the last months.
Anyway, next time I have a lucid dream, I will try to recall past déjà vu experiences and try to study the circumstances.

My personal theory is that if the déjà vu experience was caused by earlier experiences in the same life, I will recall them.
If the déjà vu experiences is from a past life, it may be possible to remember more of the past life. If not, I don't find it likely that the déjà vu experience was caused from a past live at all.

Have anyone tried this?

No, I don't believe in reincarnation, and yet when we feel we are in touch with something from the past, this may very well account for it ...

In other words these folks are still very much alive and living in the spirit. While it also suggests the resurrection is not something that occurs at later date, but shortly after we die, when in fact we are resuscitated as spirits in the spiritual world.

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So when the body dies, and consciousness departs, where do "we" go? ... Off to define another "reality" perhaps?