First I have to say: I love cats. Totally. I couldn't live without a cat.
Now here's my dream.

I'm lying in my bed, in my house, everything is normal. I am sleeping, I can see myself sleeping from above. But a meowing wakes me up. This is normal too, my cat wakes me up sometimes when he's cold and needs cuddling. I wake up but the cat is not my ginger cat, it's a white cat who's calling me and walks towards the bathroom. I follow him and when I enter the bathroom I find it full of dead, bleeding, drowed, agonizing cats.
I go back to bed telling myself that it's just a dream. Back to square one: I'm sleeping in my bed, the cat calls me, I go to the bathroom and find the dead cats. I run back to bed.
The third time I was so distressd I could feel myself sleeping and at the same time my brain was totally awake. I started calling out for myself, to wake up, desperately. So I felt myself double, one myself who was having the nightmare, and the real myself who was aware of the nightmare and was trying to wake me up. Soooooo weird. I woke up at the end in the middle of the night and I could go back to sleep at all....

PS: Not nice, but the waking-dreaming experience was interesting