It would seem that Len mulls over such things in his subconscious mind.
As does everybody ... we are just not aware of doing so. That's why it's called the
subconscious.
He could for instance rather have had a more trivial dream.
Once again ... so could everybody!
I attach no more importance to them than any other dreams. As I have already said, they are just the brain passing the time ... rather like chewing on a piece of grass while thinking.
Many people have seized on the phenomenon to make money out of the credulous.