whats your worst nightmare

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Yesterday i had a night mare which i cannot tell the worst because the worst one was that i was thrown in a gutter with full of blood and bones on me.I Cannot really tell what happened as only a part of that was remembered by me, i forgotted the rest. Why is that so?? why cant we remember the full dream in our night. Some can be remembered fully but some cannot,why is that??Tell me your worst nightmare you had ever??