hey.
some people have this anomalous experience where... things seem significant... like there is some kind of message in events.
some people have this anomalous experience where... things seem familiar... like they have been there before.

it is thought to be an endogenously generated experience (from internal factors) and it is a sensation that you have been there (in that precise situation) before.

i guess it depends on how exact your experience is. i have it quite a lot where i'm sure i've been exactly where i am before. where the people are and everything. sometimes people conclude they dreamed it before it happened... sometimes people have been to the place before (and forgot being there) but sometimes it is more than the place it is precisely where the people are and well... that can't have been experienced before. it is supposed to be an illusory experience because... you haven't been in that precise circumstance before.

people with all kinds of dx's (and with no dx at all) can have deja vu experiences.

they can be kinda freaky sometimes.
i don't think it is related to the DID...
but i know i tend to have the experiences more when i am tired... or overtired...