The Messenger of Allah ﷺ as saying: When one you sleeps, the devil ties three knots at the back of his neck, sealing every knot with, "You have a long night, so sleep." So if one awakes and mentions Allah, a knot will be loosened; if he performs ablution another knot will be loosened; and if he prays, the third knot will be loosened; and in the morning he will be active and in good spirits; otherwise he will be in bad spirits and sluggish.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ يَعْقِدُ الشَّيْطَانُ عَلَى قَافِيَةِ رَأْسِ أَحَدِكُمْ إِذَا هُوَ نَامَ ثَلاَثَ عُقَدٍ يَضْرِبُ مَكَانَ كُلِّ عُقْدَةٍ عَلَيْكَ لَيْلٌ طَوِيلٌ فَارْقُدْ فَإِنِ اسْتَيْقَظَ فَذَكَرَ اللَّهَ انْحَلَّتْ عُقْدَةٌ فَإِنْ تَوَضَّأَ انْحَلَّتْ عُقْدَةٌ فَإِنْ صَلَّى انْحَلَّتْ عُقْدَةٌ فَأَصْبَحَ نَشِيطًا طَيِّبَ النَّفْسِ وَإِلاَّ أَصْبَحَ خَبِيثَ النَّفْسِ كَسْلاَنَ  

Do not give up prayer at night, for the Messenger of Allah ﷺ would not leave it. Whenever he fell ill or lethargic, he would offer it sitting.  

عَائِشَةُ ؓ لاَ تَدَعْ قِيَامَ اللَّيْلِ فَإِنَّ رَسُولَ اللَّهِ ﷺ كَانَ لاَ يَدَعُهُ وَكَانَ إِذَا مَرِضَ أَوْ كَسِلَ صَلَّى قَاعِدًا  

The Prophet ﷺ said: May Allah have mercy on a man who gets up at night and prays, and awakens his wife; if she refuses, he should sprinkle water on her face. May Allah have mercy on a woman who gets up at night and prays, and awakens her husband; if he refuses, she would sprinkle water on his face.  

قَالَ رَسُولُ اللَّهِ ﷺ رَحِمَ اللَّهُ رَجُلاً قَامَ مِنَ اللَّيْلِ فَصَلَّى وَأَيْقَظَ امْرَأَتَهُ فَإِنْ أَبَتْ نَضَحَ فِي وَجْهِهَا الْمَاءَ رَحِمَ اللَّهُ امْرَأَةً قَامَتْ مِنَ اللَّيْلِ فَصَلَّتْ وَأَيْقَظَتْ زَوْجَهَا فَإِنْ أَبَى نَضَحَتْ فِي وَجْهِهِ الْمَاءَ  

The Prophet ﷺ said: If a man awakens his wife at night, and then both pray or both offer two rak'ahs together, the (name of the )man will be recorded among those who mention the name of Allah, and the (name of the) woman will be recorded among those who mention the name of Allah. Ibn Kathir did not narrate this tradition as a statement of the Prophet ﷺ, but he reported it as a statement of Abu Sa'id. Abu Dawud said: This tradition has been narrated by Ibn Mahdi from Sufyan and I think he mentioned the name of Sufyan. He also said: The tradition transmitted by Sufyan is a statement of the Companion (and not that of the Prophet).  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا أَيْقَظَ الرَّجُلُ أَهْلَهُ مِنَ اللَّيْلِ فَصَلَّيَا أَوْ صَلَّى رَكْعَتَيْنِ جَمِيعًا كُتِبَا فِي الذَّاكِرِينَ وَالذَّاكِرَاتِ وَلَمْ يَرْفَعْهُ ابْنُ كَثِيرٍ وَلاَ ذَكَرَ أَبَا هُرَيْرَةَ جَعَلَهُ كَلاَمَ أَبِي سَعِيدٍ