Revive A Forgotten Sunnah
Kuraib, the freed slave of Ibn ‘Abbas, reported that Ibn ‘Abbas narrated to him that……
The Messenger of Allaah (may peace be upon him) slept up till midnight, or a little before midnight of a little after midnight, and then got up and began to cast off the effects of sleep from his face by rubbing with his hand…….
(Muslim Book #004, Hadith #1672)
I.e To use the two joints of the thumbs to wipe off the build up of the effects of sleep from the eyes.