Waking up in different 'reality'

Has anyone ever experienced this?

I had a dream about a week and a half ago, can't remember exactly what it was, but when I woke up, I felt like I was really in a different 'me', than the guy who'd gone to sleep the previous night. My reactions to things were not what I'd been consciously trying to practice in my day to day life, and I had different 'mind patterns', as in not even caring about what I was interested in previously, as much or not at all even. It was a distinct feeling of loss too, as if I knew I had work to do, to get back to the desirable state of being previously (at least that is something I was thinking about). It may be more accurate to say that overall, I woke up a stranger to myself. Not completely drastically of course, but a definite sense of 'something isn't quite right'.

Any thoughts? Or am I just going a bit loopy!

I had a somewhat parallel experience. I once woke up feeling I was in a different life and briefly I could access the memories from that life which were extensive, full and vivid and completely different than my present waking life.
It faded quickly.
Also I can recall whole dream series from this life and when I'm in the right state they seem to extend back through all the dreams I have ever had like a file drawer that opens up 
yeah we are probably a bit loopy