How does Bolztmann Brain explain experience of time? If a Boltzmann Brain existence is fleeting due to the absence of supporting organs and environment, how does the thought experiment account for the passage of time it experience in its brief existence? Even if the brain pops into existence complete with a lifetime worth of memory, how does it explain going through those memory as if one is living through them one day at a time?
 A: Well, if you think about it carefully, you will realize you only ever have the experience of the passage of time in the current moment. You never have any experience of passage of time in a past moment, you only have a memory of said experience, even if the experience seems to have taken place just a split second ago. This memory of the past does not need to be real (formed by an actual experience), it can just be an artefact of the Boltzmann brain, a file in your memory that appeared randomly. So the only thing the Boltzmann brain has to do is to provide an experience of a single moment of time. This can be done, in principle, without organs and so on.
Let me reiterate, the Boltzmann brain concept is hard to wrap one's head around because the moment it needs to create is not the one where you are first examining the concept, checking it for logical consistency, thinking about your past, checking whether you experience the passage of time etc. It only ever needs to create is an experience of now, the now that is happening as you finish reading the last word of this sentence.
