I recently began reading "Sri Ramakrishna The Great Master". I just started a chapter titled "Sadhaka and Sadhana" and the answer to this question addresses the (lucid) dream analogy.

Find "Question: Well, what is the cause of that delusion?" and below is the pertinent part of the answer as it relates to this thread. The entire answer puts it in better context.

https://www.ramakrishnavivekananda.i...Master-13.html

You may raise the objection that certain persons have sometimes the conviction that they are dreaming when they are actually in the dream state. But, there also they get that conviction from the memory of the waking state. Similarly some people are seen to have the memory of the reality of the non-dual Brahman when they are conscious of the world in the waking state.

"memory of the reality of the non-dual Brahman"... That is what I label "knowing".