The document discusses the author's first experience with sleep paralysis, a phenomenon where one feels awake but unable to move or speak during waking or sleeping transitions. The author researched sleep paralysis and found cultural myths about it, such as Scandinavian folklore associating it with a mare spirit sitting on people's chests. Scientifically, sleep paralysis occurs when one becomes aware during transitions between REM and non-REM sleep, when the body is temporarily paralyzed. The author's terrifying first experience involved feeling a presence and seeing a shadowy figure move towards their bed.