Spirit world
Ones beliefs and experiences are usually kept quiet because of those who say it doesn't happen. Might not, it might, I'll say I do not know.
Very soon after my Mother died I was laying in bed, I heard her call my name, did she really? I do not know
Very shortly after my Mother died my sister who was 9 months pregnant, heard her call her name. Did it happen, I do not know.
It only happened once I am very glad to say.