Aisha reported: The Messenger of Allah, peace and blessings be upon him, would get ready for sleep, he would blow into his hands, recite the two chapters of refuge (surah al-falaq and surah an-nas), and he would wipe his hands over his body.
Source: Sahih Bukhari 5960
Grade: Sahih (authentic) according to Al-Bukhari
عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ إِذَا أَخَذَ مَضْجَعَهُ نَفَثَ فِي يَدَيْهِ وَقَرَأَ بِالْمُعَوِّذَاتِ وَمَسَحَ بِهِمَا جَسَدَهُ
5960 صحيح البخاري كِتَاب الدَّعَوَاتِ بَاب التَّعَوُّذِ وَالْقِرَاءَةِ عِنْدَ الْمَنَامِ