When I was really little, i remember I was walking through a church and entered the main room, only to find a vampire praying to a candle that I figured symbolized the devil. The candle was sitting atop a piano/organ or a tall, long wooden table of some sort.
While he was in mid-prayer, I walked up to the candle and extinguished it with something. I can't remember what I used.
The vampire immediately noticed and lifted me up off the ground. In his rage, he sunk his teeth deep into my neck, which is when I woke up.
No idea why I remember that so vividly, I was pretty young at the time and I'm pretty sure it only happened once.
Also, when I was a kid, I remember right before any nightmare occurred, a near-blinding, "sharp" (for lack of a better word), sparking point of light would start slowly at the end of the hall, then speed up in a spiral motion and travel down a long hallway toward me. The nightmare would start just as the point of light smashed into my face. The only way to not have a nightmare was to try and wake up before the light hit me. Eventually it just stopped happening.