Albert Einstein was considered at school as a bogus because he always had his head in the clouds. His name is now used as synonymous with genius. Is there a link between his scientific creativity and his state of mind?
Many Studies prove that yes, there is one.
For instance, Ut Na Sio and Thomas C. Ormerod state that: “When solving a creative problem, individuals benefit from performing a wide search of their knowledge to identify as many relevant connections as possible with the presented stimuli. Each time individuals reapproach the problem, they improve their per- formance by extending the search to previously unexplored areas of their knowledge network.” I invite you to read Does Incubation Enhance Problem Solving? A Meta-Analytic Review Ut Na Sio and Thomas C. Ormerod – Lancaster University: http://www.psy.cmu.edu/~unsio/Sio_Ormerod_meta_analysis_incubation_PB.pdf
and the Wikipedia article on Incubation (psychology): https://en.wikipedia.org/wiki/Incubation_%28psychology%29#The_Cases_For_and_Against_Dreams_Being_Useful_In_Problem-Solving
Jacques Higelin, Tombé du ciel: https://youtu.be/AJ5Dp-_QFQ8