Have you ever found yourself seeing images right before falling asleep? You might be experiencing hypnagogia.

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Sources:

https://www.theatlantic.com/science/archive/2016/04/deciphering-hypnagogia/478941/
https://www.scientificamerican.com/article/tetris-dreams/
https://www.sleepassociation.org/patients-general-public/hallucinations-during-sleep/
http://www.merckmanuals.com/professional/neurologic-disorders/sleep-and-wakefulness-disorders/narcolepsy
http://www.sciencedirect.com/topics/neuroscience/hypnagogia
https://www.ncbi.nlm.nih.gov/pubmed/8894197
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4173919/
https://www.britannica.com/topic/dream-sleep-experience#ref423110
https://www.ncbi.nlm.nih.gov/pubmed/24051119
https://books.google.com/books?id=q_vpBAAAQBAJ&pg=PA117
https://www.psychologytoday.com/blog/dream-factory/201502/how-dream-salvador-dali
http://www.bbc.com/future/story/20150409-i-have-exploding-head-syndrome
https://www.merriam-webster.com/dictionary/hypnagogic
https://pdfs.semanticscholar.org/09d8/95b85d772fb505144969310255c0cbdc74a7.pdf

http://www.academia.edu/33150155/Replaying_the_Game_Hypnagogic_Images_in_Normals_and_Amnesics

http://www.businessinsider.com/what-is-a-hypnic-jerk-2014-5
https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Myoclonus-Fact-Sheet
https://www.sleepassociation.org/patients-general-public/sleep-myoclonus/
http://www.bbc.com/future/story/20120522-suffer-from-sleep-shudders