So when I was around 11 or 12 I was staying over at my grandparents' house. It was around 5 in the morning and I haven't gone to sleep yet. I tried to go to sleep but couldn't. But it got to that moment where I almost fell asleep but then I couldn't breath anymore. I no longer had control over my body and it felt like something heavy was on my chest. Then something weird happened. I can't really explain it. It was like I couldn't imagine anything but darkness and their was like a long beeping sound that lasted for about 20 seconds. When it ended I bolted up and looked around. There was nothing but I was scared as f*** and stayed awake 'til morning. This happened on and off over the years and I had no explanation for it. I later found out that it might be sleep paralysis. It's really scary.