I used to see dreams (and was so much perturbed) that I began to quiver and have temperature, but did not cover myself with a mantle. I met Abu Qatada and made a mention of that to him. He said: I heard Messenger of Allah ﷺ as saying: A good vision comes from Allah and a (bad) dream (hulm) from devil. So when one of you sees a bad dream (hulm) which he does not like, he should spit on his left side thrice and seek refuge with Allah from its evil; then it will not harm him. (Using translation from Muslim 2261a)
كُنْتُ أَلْقَى مِنَ الرُّؤْيَا شِدَّةً غَيْرَ أَنِّي لَا أُزَمَّلُ حَتَّى حَدَّثَنِي أَبُو قَتَادَةَ أَنَّهُ سَمِعَ رَسُولَ اللهِ ﷺ يَقُولُ الرُّؤْيَا مِنَ اللهِ وَالْحُلْمُ مِنَ الشَّيْطَانِ فَإِذَا حَلَمَ أَحَدُكُمْ حُلْمًا يَكْرَهُهُ فَلْيَبْصُقْ عَنْ يَسَارِهِ ثَلَاثَ بَصَقَاتٍ وَلْيَسْتَعِذْ بِاللهِ مِنَ الشَّيْطَانِ فَإِنَّهُ لَا يَضُرُّهُ