I was just being a wise guy but that is an interesting question.....IDK, but fun to speculate.

I am not sure one would need to as the equations, as best as I understand it, are a means to translate between the inertial reference frames of two different observers. Space and time are of course observer dependent and the equations allow observer A to know how observer B is experiencing spacetime.

If we are talking about the dreams we experience at night when we are asleep, then I tend to think of that as a reality I am creating all by myself. That is to say there would not be any other observers in their own reference frame in that dream as all is dependent upon my consciousness. Although some say they can enter each others dreams but I don't have any knowledge of that.

When we are 'awake', we are also creating our own reality, but if it is a shared reality, then we do so in concert with others. Willingly sharing information through a common communication matrix of sorts, all inputting and outputting with each other to create individual realities that interact with each other. Somewhat like in the movie. So yes we create our own realities, but we use shared information to create those individual versions within our minds giving us a shared experience (parallel realities/universes). But not entirely the same as we see that spacetime and matter are observer dependent, related, but unique to each observer. So in a sense the equations are allowing consciousness A to know how consciousness B is manifesting spacetime within their own reality and vise versa. Allowing a shared experience of reality, not identical, but still mathematically linked by the transformations. In practice, our inertial reference frames (our individual spacetime realities) are similar enough in spacetime and velocity that for all practical purposes it seems like an independent reality in which we are both "in", yet in truth it is those separate realities being created by each of our 'minds'. Kind of like in the movie how everyone felt like they were 'in' the matrix, but in reality they were all in separate pods, and it was the matrix that was 'in' everyone.