this probably sounds a lot more dramatic than intended.
i can only assume we've all been there though,
you wake up in your own bed, your own room + as far as you were aware you had no alcohol/other substances.
yet you still wake up feeling confused to no end??
like this morning i was almost even asking who i was, for a good thirty seconds i had NO idea what was going on.
i'm not a sleep expert but left to my own conclusion i'd say i was stuck between the waking + the dreaming world.

lucid dreaming is a whole different subject altogether + it's wonderful /dreamy sigh.