If any of you wakes up from his sleep and wants to perform ablution, let him blow from his nose the water that he inhales three times, for the devil spends the night on his nostril. [Al-Bukhari ]

"عن أبي هريرة -رضي الله عنه- قال: قال رسول الله -صلى الله عليه وسلم-: «إذا اسْتَيقظَ أحدُكم من منامه فتوضأَ فليَستنثرْ ثلاثا، فإن الشيطان يبيت على خَيشُومه». [صحيح.] - [متفق عليه.]"