As is often said maybe it's part of getting older. It seems when resting but not asleep or during arbitrary moments during the day images or phrases having no significance flash by me. For instance, the phrase 'the rib on the watermelon' came to me. What the heck is that? Another time when resting I saw in my mind's eye about 35 feet away four aging ladies neatly dressed in a mall in one of the walkways on a circular lounge staring in my direction but not at me. That was it.
There is also a realm when I'm up but not focused where my mind wanders through different scenarios. One can say it all has meaning because nothing is by accident. But it seems most are random and scattered without substance. Perhaps it's my electrical circuits cleaning themselves out. Or wearing out? I'm curious if this happens to others. After a lifetime of always looking for meaning I'm now receiving meaninglessness. Ha.