Messenger of Allah, I have seen in the state of sleep as if my head had been cut off. Thereupon Allah's Apostle ﷺ laughed and said: When the satan plays with any one of you in the state of sleep, do not mention it to the people; and in the hadith transmitted by Abu Bakr (the words are): "If one of you is played with, and he did not make any mention of the word: "Satan."  

جَاءَ رَجُلٌ إِلَى النَّبِيِّ ﷺ فَقَالَ يَا رَسُولَ اللَّهِ رَأَيْتُ فِي الْمَنَامِ كَأَنَّ رَأْسِي قُطِعَ قَالَ فَضَحِكَ النَّبِيُّ ﷺ وَقَالَ إِذَا لَعِبَ الشَّيْطَانُ بِأَحَدِكُمْ فِي مَنَامِهِ فَلاَ يُحَدِّثْ بِهِ النَّاسَ وَفِي رِوَايَةِ أَبِي بَكْرٍ إِذَا لُعِبَ بِأَحَدِكُمْ وَلَمْ يَذْكُرِ الشَّيْطَانَ  

“A man came to the Prophet ﷺ when he was delivering a sermon and said: ‘O Messenger of Allah! Last night in my dream I saw my neck being struck and my head fell off, and I chased it, picked it up and put it back.’ The Messenger of Allah ﷺ said: ‘If Satan plays with any one of you in his dreams, he should not tell people about it.’”  

أَتَى النَّبِيَّ ﷺ رَجُلٌ وَهْوَ يَخْطُبُ فَقَالَ يَا رَسُولَ اللَّهِ رَأَيْتُ الْبَارِحَةَ فِيمَا يَرَى النَّائِمُ كَأَنَّ عُنُقِي ضُرِبَتْ وَسَقَطَ رَأْسِي فَاتَّبَعْتُهُ فَأَخَذْتُهُ فَأَعَدْتُهُ فَقَالَ رَسُولُ اللَّهِ ﷺ إِذَا لَعِبَ الشَّيْطَانُ بِأَحَدِكُمْ فِي مَنَامِهِ فَلاَ يُحَدِّثَنَّ بِهِ النَّاسَ