Oh girl - I'm a HUGE dreamer - I've dreamt the girls were killed in an awful way and woke up and actually heard my ownself screaming...I wasn't a serial killer like you were

but I know just what you mean about how upsetting dreams can be....You may have seen something on tv or read too many horror stories and it just incorporated into your subconcious - it doesnt mean you'd ever harm an animal -
just like when I dream about Tom Selleck... I know I'll NEVER get lucky & nail him -

but it doesn't stop him from invading my sleep