Annul Bad Dreams with Prayer

The Messenger of Allah (sal Allahu alaihi wa sallam) said: “Dreams are of three types: A good dream which is glad tidings from Allah, a dream from the Shaitaan which causes distress, and a dream that comes from a man’s own self (what he is thinking). If one of you sees something that he dislikes, let him get up and offer prayer, and not tell people about it.” [Sahih Muslim]

The effects of bad dreams can be annulled with prayer. Be sure not to tell anybody what you saw, instead pray to Allah Almighty, the Only One with the power to do anything, to give your dream a good outcome, and the dream will not then be able to harm you InshaAllah.