P/S/A: that thing that happens at night sometimes where it feels like you can't move and maybe some other crazy shit is happening like a demon is sitting on your chest or there's an intruder in your room... is called sleep paralysis. At least in my case, you can make it go away by fixing your sleep schedule, although according to Wikipedia it might also be a symptom of narcolepsy.
I was lucky enough to have read about that before the one time it happened to me. So I wasn't scared. I just thought, So this is sleep paralysis. Since then I've read that lucid dreamers often try to force themselves into sleep paralysis, as it's the first stop to the sandman's brooding realm. The next time it happens to you, you should try for a Feynman-style lucid dream. It could be fun.
P/S/A: There are single sentences which can create life-changing amounts of difference.