That a number of great inventors and geniuses have the seemingly same "dream" state of creative consciousness. I read that Edison would sit in his lab holding his keys in his hand, so when he fell asleep the falling keys would awaken him. His best thoughts were developed in a close state of near sleep. Edgar Casey, called the sleeping prophet, would be in a dream state as he would foretell the future and do medical diagnoses. Einstein saw the relationship with time and space while daydreaming on a city bus. Seems Tesla also had an ability while in a dream state to see great things. The subconscious mind may have abilities we have not yet began to understand.