It depends. It can feel like not hearing properly, although I understand all the words. If I have my eyes open, sometimes I don't recognize parts of my own body or surroundings. I might also see my T differently. Other times itt's more that I can't concentrate, can't focus on any one particular thing. Usually my voice gets more "flat". When I have my eyes closed, sometimes it feels like falling into a neverending hole. I feel detached from my emotions and surroundings, but I can follow instructions usually, like sitting upright, opening my eyes...