The definition of dreams may involve waking states like day-dreams and a variety of distinct experiences

 Reference 

When a working group of scientists got together in 2001 to define “dreams”, they were unable to provide a single definition. Rather, they recommended a wide definition of dreams that extended beyond nocturnal hallucinations to include waking states and spectrums related to recall and content.


Pagel, J. F., Blagrove, M., Levin, R., States, B., Stickgold, B., & White, S. (2001). Definitions of dream: A paradigm for comparing field descriptive specific studies of dream. Dreaming, 11, 195-202. https://link.springer.com/article/10.1023/A:1012240307661

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