«إذا استيقظ أحدكم من منامه فتوضأ فليستنثر ثلاث مرات فإن الشيطان يبيت على خياشيمه»
The Prophet (peace and blessings be upon him) said:
"When one of you wakes from his sleep and performs ablution (wudu), let him blow out his nose three times, for Satan spends the night in the upper part of his nose (the upper part of the nostrils)."
[إذا استيقظ أحدكم من نومه فرأى بللا ولم ير أنه احتلم اغتسل وإذا رأى أنه قد احتلم ولم ير بللا فلا غسل عليه]
The Prophet (peace and blessings be upon him) said:
"When one of you wakes from his sleep and sees moisture but does not recall having had a wet dream, he should take a ritual bath (ghusl); and if he sees that he had a wet dream but does not see any moisture, then a ritual bath is not obligatory upon him."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 330