Image credit: Johann Heinrich Füssli
Please note this isn't a claim that anyone with these symptoms definitely has this, or a diagnosis of any kind, just an alternative to paranormal causes backed by reliable scientific and professional sources - it is intended to allow anyone interested in the subject to have as much varying information at their fingertips as possible, and ruling out normal, mundane explanations for a suspected paranormal event is the first step in a critical thinking approach to investigating and understanding phenomena.
National Center for Biotechnology Information
A Service of the U.S. National Library of Medicine National Institutes of Health
Over 300 articles containing references to sleep paralysis in some way
Global $22.6B pharmaceutical company whose highest priority areas include sleep disorders
Article on narcolepsy, features of sleep paralysis, hallucinations
Pennsylvania State University
Milton S. Hershey Medical Center
Brief article on Isolated Sleep Paralysis
Scientific American "Magazine"
Ask the Brains: What is Sleep Paralysis?
Clear, easily understandable and informative article
Psychology Today "Magazine"
Sleep Paralysis Gets ScreentimeBut Not as a Horror Flick
Brief article with links to related subjects
Although not a clinical medical site, deals with scientific and medical issues
Scholarly site suggesting mundane explanations for paranormal subjects
Article and number of other various sleep paralysis links
Scientific-oriented site and providers of scholastic materials
Long research paper on SP written for a university course
Association for the Scientific Study of Anomalous Phenomena (ASSAP)
Scientifically-orientated educational charity and amateur research organisation dedicated to a better understanding of anomalous phenomena
Long article on sleep paralysis and sleep-related hallucinations, also has article on temporal lobe epilepsy
Intended to present reliable contemporary dream science information; lucid dreaming, nightmares, and so-called altered states of consciousness
Author has MA in Consciousness Studies and a Certificate of Dream Studies, BA degree specializing in archaeology
Article on Sleep Paralysis and Spirits
Trionic Research Institute
Awareness During Sleep Paralysis (ASP)
Semi-scientific site dedicated to ASP
Experience Project is the largest living collection of shared experiences.
Over 122 people noting their own sleep paralysis experiences
Sleep Paralysis Explained (Sorta) Part 1