"If one gets up to pray at night and his eyes are overtaken by sleep while in sujood, Allaah says to His angels: Look, my angels! This is My slave! His soul is with Me and his body is before me. Record his qiyaam for him and count his sleep as a Sadaqah from Me on him."
[Source: Ibn Maajah; authentic (Saheeh Ibn Maajah)] (via ittibaa)