French philosopher Gaston Bachelard wrote in 1960 that “sleep opens within us an inn for phantoms.” Recent research agrees, finding that some sleepers shriek or even gorge themselves without knowing it. These sleep-disorder sufferers experience neural glitches that mix conscious and unconscious states. Scientists are now searching for the physiological underpinnings in hopes of developing better drug therapies.
I've had #4 (sleep paralysis) a bunch of times. To tell you the truth it is not fun at all waking up not being able to move. I always get really scared and try to scream or bang on the wall to wake someone else up but it never works. Also when I was sleeping on my stomach I woke up and my face was pressed into the pillow and I thought I was being smothered, also not fun.
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