You ever wake up like “Where am I?!”

[anscochrome]

Only briefly of course, only briefly.

I’ve done this several times in my life, along with the one where you think you’re somewhere else (childhood home etc.) for a split second.

Yes, I have awakened in a state of mental confusion where you don't know where or who you are. It takes about 3 seconds to fade and re-sync. It is a quite frightening experience, fortunately, it has only happened several times in my entire life. The fade away to reality is about the same length of time for awareness of a deja vue to fade away.