When I was awake, I saw a black air mass, which seemed to have life.

Ghost pressing bed is a physiological reaction, which is scientifically considered to be a state in which the brain wakes up and the body is in a sleep state. At this time, people can't move, just like a ghost press, they will also have various feelings, such as vision and breathing. You and your roommate have this situation together, maybe because your life rhythm is similar, maybe because of fatigue or leisure, and the reason is unknown.

So don't be afraid, just believe in science, then enter this state with confidence, don't be afraid, don't move, and then go to sleep.