Narrated Abu Huraira:

Allah's Messenger peace be upon him said, "If anyone of you performs ablution he should put water in his nose and then blow it out and whoever cleans his private parts with stones should do so with odd numbers. And whoever wakes up from his sleep should wash his hands before putting them in the utensil, because nobody knows where his hands were during sleep."

Bukhari and Muslim.

Narrated Abu Huraira: 

The Prophet peace be upon him said, "If anyone of you rouses from sleep, he should wash his nose by putting water in it and then blowing it out thrice, because Satan has stayed in the upper part of his nose all the night."

Muslim.