Can someone explain my terrifying experiences with a dark shadowed figure/form pinning me down on my bed as I am falling asleep... I am struggling fercely and screaming for help... I feel totally violated and helpless... it floats out of window when disturbed by my husband checking on me...

A much more possible idea of what is happening.

Sleep Paralysis (http://www.webmd.com/sleep-disorders/guide/sleep-paralysis)

Sleep paralysis - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Sleep_paralysis)

Thank you for your prompt response.