Sleep paralysis is a feeling of being conscious or awake but unable to move. When this occurs, one maybe unable to move or speak for a few seconds or minutes. Some people may also feel pressure or choking Feelings.

This is a sign that your body is not functioning properly through the stages of sleep. Sometimes, people describe sleep paralysis as an evil stronghold or presence of night demons because of that mysterious and scary strangling feelings, like someone is choking you or something.
scary right?

Well, it is a common condition and can affects men and women and often first noticed in the teen years. It can also be a genetic condition.

Sleep paralysis occurs either when one is falling asleep (Hypnagogic or Predormital Sleep Paralysis) or when one is waking up (Hypnopompic or Postdormital sleep paralysis). It is less noticeable when it happens when you are falling asleep. This is because, when you fall asleep, you become less aware.
When you fall asleep, your body slowly relaxes. Usually you become less aware, so you do not notice the changes. However, if you remain or become aware while falling asleep, you may notice that you cannot move or speak.

Here are major causes and Treatments of sleep paralysis
https://www.plumdynamic.com/causes-treatment-of-sleep-paralysis/