whenever the Prophet (saas) went to bed, he would blow into his hands, recite Al-Mu'awwidhatain, then wipe his hands over his body.
أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا أَخَذَ مَضْجَعَهُ نَفَثَ فِي يَدَيْهِ وَقَرَأَ بِالْمُعَوِّذَتَيْنِ وَمَسَحَ بِهِمَا جَسَدَهُ