I generally know exactly where I am when I wake up unless I am very tired.
Every once in a very great while, I will be exhausted enough to experience additional confusion; after staying up for days and waking on a strange couch, this period of "amnesia" lasted several minutes. I could not remember my name, where I was, or who I was. I finally remembered my friend's name, and then mine.
This is quite a rarity but over the past two weeks, it has happened to me three times! I have woken without a clue as to my name or surroundings or any personal details. The dream I had just finished was the closest thing to reality, and then it faded too. I am moving in eight days, so not only am I stressed and worried about change, but my house looks and smells different.
Does anyone else wake up with what seems to resemble temporary anteriograde amnesia?