There have been so many recorded cases of past life regression not to take some notice and on top of that, if you believe in ghosts, then something must happen after death.
It's not a foregone conclusion that if there are ghosts, then there must be life after death and therefore reincarnation, but it's one way that the circle becomes whole.
I would hate to think that we are on this earth for our allotted three score years and ten and that to be that. I think that if you have ever had that deja vu sensation, then you may well be recognising something from a previous existence.
It's not something I have studied, but it is something I have postulated on for some time.
I suspect that there are going to be people out there in internet-land that think I'm one stick short of a yard broom, but so be it.