To me, it sounds like you'd had a night of excellent sleep!
I'd love to sleep a whole night like that every night!
I do, on occasion, sleep through like that.
I do not have DID.
While I cannot determine if you have DID, I can say your reported sleep experience is not a diagnostic indicator for DID.
I am sorry you are experiencing some diagnostic uncertainty. I hope your pdoc, if you see one, can help you with diagnosis(es).

WC