
Daytime mind wandering is linked to dream content while asleep, study finds

Third, during mind-wandering, your mind will—Nathan said—engage in “mental time-travel,” where it roams over the past and tries to predict the future.
Johann Hari • Stolen Focus: Why You Can't Pay Attention--and How to Think Deeply Again
Our default waking mode (and also during dreaming phases of sleep) is not a brain at rest, but what is known as mind wandering.
Venkatesh Rao • Make Your Own Rules
Research on this has been done, as well. In a study titled, “Where the Eyes Wander: The Relationship Between Mind Wandering and Fixation Allocation to Visually Salient and Semantically Informative Static Scene Content,” a group of scientists attempted to observe how the mind orders and prioritizes visible information and how conscious we are of
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