I sometimes cannot spontaneously remember, when waking up, where I am. It is not related to the place (usually happens in my own bed), nor to events the night b

I sometimes cannot spontaneously remember, when waking up, where I am. It is not related to the place (usually happens in my own bed), nor to events the night before (standard evening and night) neither to the sleep phase (I usually wake up on my own). I then need to think hard about the place, the context, etc. before rationally settling up on the place. I only then open my eyes.