Sleep paralysis is the feeling of being unable to move or speak while you’re falling asleep or waking up by using Modvigil 200. This can last seconds or a few minutes and can be terrifying. It can be accompanied by hallucinations, which are false perceptions that occur during REM sleep. These are often frightening and cause feelings of suffocation or a presence in the room. They also cause you to feel unable to breathe, which is why it’s important to stay calm and refocus your mind on something else.