Sleep paralysis is a phenomenon in which a person, either falling asleep or awakening, temporarily experiences an inability to move, speak or react. It is a transitional state between wakefulness and sleep, characterized by complete muscle atonia(muscle weakness). It is often accompanied by terrifying hallucinations (such as an intruder in the room) to which one is unable to react due to paralysis, and physical experiences (such as strong current running through the upper body). One hypothesis is that it results from disrupted REM sleep, which normally induces complete muscle atonia to prevent sleepers from acting out their dreams. - wikipedia
The man who suffers from sleep paralysis is Mike Pike and he shared how he often wakes up in the middle of the night wherein he consistently experiences a half-waking state which makes him unable to move. Sometimes, he also gets the feeling of not being alone. The creepy part is that he always notices an eerie shadow;-like figure at the foot of his bed that seems to be watching him while he sleeps. The creepy episodes of his sleep paralysis led him to videotape his bedroom during those strangely sleepless nights. The video was able to document those episodes but he was shocked when he noticed something on the video.
“I’m a rationalist and a very skeptical person with no previous interest in paranormal activity, but after doing some research it seemed like there was a possibility that this entity is real, I have watched the footage over and over trying to figure out some logical explanation for what could have caused the image of what seems to be a ghost, but I haven’t been able to come up with a solution, I am really starting to believe that I captured the entity I saw during my paralysis on video. This terrifies me so much that I can no longer sleep in my room.” - Mike Pike
Mike saw the shadowy figure that he was describing before. Meanwhile, scientists claimed that sleep paralysis or also known as hypnogogia causes the illusion of shadow people. During this state people experience a feeling of dread, pressure on their chest, and visual images of shadowy beings.
For people who experiences the same thing with Mike Pike would totally agree that seeing the shadowy figure is totally not their cup of tea as it gives them a feeling of discomfort and fear.