Hadith on Fajr: Satan tries to stop Muslims praying at night

Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “Satan ties three knots on the back of your head while you are asleep. On every knot he puts the saying: The night is long, stay asleep. When you wake up and remember Allah, one knot is undone. When you perform ablution, the second knot is undone. When you pray, the third knot is undone and you will wake up energetic with a good heart; otherwise, you will wake up lazy with a mischievous heart.”

Source: Ṣaḥīḥ al-Bukhārī 1091

Grade: Sahih (authentic) according to Al-Bukhari

عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّه صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ يَعْقِدُ الشَّيْطَانُ عَلَى قَافِيَةِ رَأْسِ أَحَدِكُمْ إِذَا هُوَ نَامَ ثَلَاثَ عُقَدٍ يَضْرِبُ كُلَّ عُقْدَةٍ عَلَيْكَ لَيْلٌ طَوِيلٌ فَارْقُدْ فَإِنْ اسْتَيْقَظَ فَذَكَرَ اللَّهَ انْحَلَّتْ عُقْدَةٌ فَإِنْ تَوَضَّأَ انْحَلَّتْ عُقْدَةٌ فَإِنْ صَلَّى انْحَلَّتْ عُقْدَةٌ فَأَصْبَحَ نَشِيطًا طَيِّبَ النَّفْسِ وَإِلَّا أَصْبَحَ خَبِيثَ النَّفْسِ كَسْلَانَ

1091 صحيح البخاري كتاب التهجد باب عقد الشيطان على قافية الرأس إذا لم يصل بالليل