Creative problem-solving after experimentally provoking dreams of unsolved puzzles during REM sleep.

REM-sleep dreaming can be experimentally guided toward specific unsolved problems and improve next-day creative problem-solving. Lucid dreamers who heard soundtracks of unsolved puzzles during REM sleep reported more dreams about those puzzles. In a post-hoc analysis, participants whose dreams were successfully biased by the sound cues solved more of the associated puzzles after waking. The study provides experimental evidence that REM dreams themselves, not just sleep-related memory reactivation, contribute to creative insight, addressing a long-standing gap in dream research that had relied on anecdotal or confounded evidence.

Study at a glance

Abstract

Dreams have arguably been a source of creative insight for millennia. The specific assertion that dreams during rapid eye movement (REM) sleep promote creative problem-solving, however, has only anecdotal support, lacking strong empirical support from rigorous studies. Experimental manipulations of dream content have been confounded by waking components, such that any boost in creative problem-solving could be attributable to waking cognition rather than sleep cognition. Likewise, correlational evidence cannot unequivocally establish that dreams cause insights. Evidence that memory reactivation during sleep promotes creative problem-solving is also insufficient for implicating dreaming per se. Better methods for directly manipulating REM-sleep dreaming are needed. Here, we studied individuals who frequently have lucid dreams-realizing they are dreaming while still asleep. Participants slept after failing to solve several puzzles that had unique soundtracks, and they were instructed to continue working on a puzzle if they heard its soundtrack in a dream. Half of the soundtracks were played during REM sleep to reactivate memories of corresponding puzzles, with the goal of biasing dreams to connect with those specific puzzles versus the remaining puzzles. Those sound cues reliably increased dreaming about the associated puzzles. Furthermore, a post-hoc analysis showed that, for participants with an increase in cue-related dreaming, cues boosted later puzzle-solving. We thus expanded on a well-known phenomenon, that sounds can be incorporated into dreams and can change dream content, by substantiating experimental procedures to align dreams with the search for creative answers to specific challenges. Results highlight that REM dreams can contribute to next-day problem solving.