Sayyiduna Abu Umamah (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings be upon him) said: "The ablution for sleep is that you touch the water, then with that same hand wipe your face, your hands and your feet, like the wiping of tayammum."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7553