they are the type that seem so real, that when we wake up, it takes a few minutes for us to cop onto the fact that it was just a dream. If you were
dreaming dogs were attacking you in a
lucid dream or anything with pain, you would really think you are feeling that pain. But lucid dreams occur either just as we go to sleep or when we are about to awake. Thus we are between both states. Not 100% asleep, but not awake either. Hence they appear more real.