‏الطهارة : Hadeeth No:541 Abu Huraira said: When anyone amongst you wakes up from sleep, he must not put his hand in the utensil till he has washed it three times, for he does not know where his hand was during the night....

‏الصلاة : Hadeeth No:1720 'A'isha reported that the Prophet of Allaah (sallAllaahu alayhi wa sallam) heard a person reciting the Qur'an at night. Upon this he said: May Allaah show mercy to him; he has reminded me of such and such a verse which I had missed in such and such a surah....