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Sources:
https://www.psychologytoday.com/blog/sleep-newzzz/201502/why-do-we-dream
http://news.psu.edu/story/141221/2007/04/30/research/probing-question-what-biology-behind-dreaming
http://www.nature.com/neuro/journal/vaop/ncurrent/abs/nn.4545.html
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3557787/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4704085/
https://www.ncbi.nlm.nih.gov/pubmed/15766897
https://www.scientificamerican.com/article/why-do-we-dream/
https://www.ptsd.va.gov/public/problems/nightmares.asp
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2869395/#SD1