The idea of Friday does not exist here. Or of days at all. They are a consequence... of some initial configuration, which has led to time, and matter, and gravity, and orbits. Friday is just a name we give to a particular abstraction... a particular understanding or way we try to understand the world. Though we are of the world, we are not able to really understand what the world is.

Friday is just a time boundary. And not a very precise one. It’s useful only to help mark some level alignment with others. But what is Friday, really? It’s nothing. It’s a concept. A half-hearted concept. A weak definition of a period of changes that we use to establish some sense of order and agreement.

Friday isn’t there, because Thursday isn’t there. Nor are Saturday or Sunday. Or three o’clock pm. Or June. Or 2020 A.D., nor 4500 B.C. All just arbitrary ideas. What difference would it make if we called Friday Monday instead? Or what if we called it Tomcat? Or Running Waterfall? It’s just some arbitrary syntax we’ve associated with an arbitrary boundary of time.

And time. What is time? We have some intuitive understanding of what time is like, but are very far from any good definition that leaves us feeling satisfied. The best we can say is that time is a measure of change in the world. If there were no changes, then time would not pass - at least in a strict sense. No changes would include not just the external things around you, but you yourself, and your thoughts. If all those changes stopped, time would effectively stop. So, time is something like a way to account for internal and external changes in the world.

Maybe more precisely, it is a way to account for an internal experience which perceives internal and external changes. After all, it’s very difficult to distinguish between what you perceive as reality, and what might really be reality. Thus, time is how you perceive the changes in the world and yourself. External changes are just extrapolations based on previous perceptions.

Previous perceptions are just memories... experiences and perceptions that have been encoded in a neural network. Associations between nodes and node clusters, established through repeat exposure. An organic mechanism that responds to inputs by excitation and reinforcement. And your frontal lobe has the magical ability to poke at the network, to traverse the massively complex neural structures.

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Yet, these structures, and your ability to poke at them is both limited and flawed. You can’t actively access all of the structures at once. You have limited capacity to flow concepts into your conscious mind. And this is all a biological system, so it has all the benefits and flaws of biology. Maybe your genetics make you more susceptible to bad storage or recollection? Maybe your neural connections degrade faster or slower than normal? Maybe a car accident has damaged a portion of your structures? Maybe the pathways from memory to frontal lobe are peculiar, or exceptional, or broken?

Unlike a computer, which effectively stops functioning when memory is corrupted or otherwise inaccessibly, your brain generally always tries to make sense of the situation. Your dreams are manifestations of this mechanism... random (or perhaps not so random) firing of neural components during sleep spark ideas in your brain, and it attempts to create some kind of narrative from them. A thought about a shoe might make you think about shopping for shoes, or running in them, though you have never bought or owned them. Maybe these shoes allow you to fly in your dream. Or they dispense candy. Or they torture you, and you can’t remove them, and they drag you below the earth into a fiery pit of despair and fear. Instead of crashing, your brain fills in some kind of narrative in your dream.

But it does this in your conscious waking hours too. Your memories can come into play in your conscious interactions. Your emotions too. The only significant difference seems to be that while dreaming you have no regard for logical restrictions. In waking life, you immediately recognize the improbability of shoes that dispense candy or help you fly. But in your dream, it makes perfect sense. However, any experience or perception or narrative that does not violate your logical understanding of the world, seems plausible, and even those that may only slightly violate your understanding seem plausible.

So, what can we summarize about this? Your perception of time is based on perception of changes. Your waking world and dream world are differentiated by the fact that the experiences and perceptions of the waking world are much more restricted than those of the dream world. All experience is subject to interpretation, biological errors, and state of mind.