After having a nightmare

Upon having a nightmare, recite:

أَعُوذُ بِكَلِمَاتِ اللَّهِ التَّامَّةِ مِنْ غَضَبِهِ وَعِقَابِهِ وَشَرِّ عِبَادِهِ وَمِنْ هَمَزَاتِ الشَّيَاطِينِ وَأَنْ يَحْضُرُونَ

With the total words of Allah, I seek protection from His wrath, from His punishment and from the servants evil and from the whispers of Satan and I seek protection from (these) coming to me.
(Hisnul Hasin)