Perhaps they're simply not forming memories of their own existence. Can you ask a particular sleepwalker their own name and get answer? That might imply awareness of their own existence.
It seems most people want to make consciousness out to be more complicated in some way.
Re:Electrons May Well Be Conscious
by Madmallard on Monday May 18, 2020 @04:35AM
(#23219867)
Ever heard of amnesia? Works the same way.
In every external way they appear conscious, yet they are not. They are not aware of their own existence.
So consciousness is clearly more complicated than just "summation of changes that happened in our brain", there is something extra there, that we don't understand.