If you dream someone slapped you and you woke up immediately, pay attention to this type of dream. The slap is usually given by an angry person, to punish for an injustice said or done. Your senses were stimulated because your dream was real to you. You woke up with a shock because of the unpleasant dream imagery.
You might want to think about the events in your life right now. Maybe from there you would be able to understand why you saw this dream.
