If any of you wakes up from his sleep, let him blow water out of his nose three times, as the devil spends the night on his nostrils
عَنْ أَبِي هُرَيْرَةَ رضي الله عنه أَنَّ النَّبِيَّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا اسْتَيْقَظَ أَحَدُكُمْ مِنْ مَنَامِهِ فَلْيَسْتَنْثِرْ ثَلَاثَ مَرَّاتٍ، فَإِنَّ الشَّيْطَانَ يَبِيتُ عَلَى خَيَاشِيمِهِ».
Translation
Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "If any of you wakes up from his sleep, let him blow water out of his nose three times, as the devil spends the night on his nostrils."
Explanation
The Prophet (may Allah's peace and blessings be upon him) urges anyone who wakes up from his sleep to make Istinthar, i.e., blowing water out of the nose after sniffing it, three times because the devil spends the night on the nostril, which is the whole nose.
Source
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