I have been through that kind of experience myself more than once.  I felt like I was fully awake when I was  seeing things.  I wanted to stop things from happening in front of me, but could not.  Things that scared me or something I did not like to see happen.  At one point, I saw eveything upside down - again I thought I was fully awake - and I was worried there was something wrong with me or with my vision.  But I when I really woke up, I was relieved to know that everything I saw was just not real.  All this happened during my day-time napping/sleeping in noisy environment keeping me half-sleep or half-awake, ...!  It was a painful mind boggling experience and I wished I did not have to go through that kind of experience again .... !!