Unwelcome Midnight Creep

An actual experience I had years back when I was trying to sleep, I felt this pressure on my torso and I couldn't breathe while it was on me, it was like someone was sitting on me, but nothing was in my room and I was terrified to move, all I wanted to do was keep my eyes open to make sure nothing was around me, but I still felt as if something was still lurking in my room.