Sleep Paralysis

I've had it before. At first I kind of freaked out, cause I was "awake", but I couldn't move, nor could I talk or even open my eyelids.

There have been a few times where I sort of force myself to move, and sometimes it works. Should I "fail" however, I more or less force myself to go back to sleep, knowing this'll blow over in the morning.

A psychology class I took says that it's an uncommon occurance, and it's probably a leftover from evolution, where your brain locks down your body to prevent you from acting out your dreams. Cause back then, there were real dangers when early man went to sleep, and they could for instance fall down a cliff while asleep, or walk into a hungry predator after leaving their protective areas.

But most of the time you don't realize this cause you're sleeping, it's when you start waking up and notice your body's still on "lockdown", where people start wondering wtf is going on. And since their understanding of the world and science wasn't as advanced as ours, they had to come up with reasons for it happening (hence the popular "demon/evil spirit" sitting on your chest thing almost all those cultures seem to mention).

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