It's sort of like a universe sized house of mirrors in a way, is one of my quixotic ways of thinking about it. Reflections of light, which equals energy, which converts to matter at some point, constantly being bounced at.... well, the speed of light & in the process being duplicated in the countless numbers of times we do not have the capacity to count.
As for something from nothing... So wonderfully human of us that we cannot permit this to be so except by "supernatural" means. Not the same thing, but once I learnt of them I found the concept of quarks endearing and sort of explanatory of how the concept of not knowing how or what, etc., does not make something not possible. Here are two scientists in the early sixties extrapolating that 'something' had to exist because hadrons did; hadrons could be proven to exist physically by then but what they consisted of could not be seen but had to be present. Their science created the only possible solution which were quarks: elementary particles and fundamental constituents of matter. At the time of the two scientists theory, the only evidence for their existence was the need for them to exist! But science, on the whole, accepted that they did. It wasn't until four or five years later that their actual physical existence was first observed!....................................