Abu Umama reported that the Messenger of Allah, may Allah blesshim and grant him peace, passed by a man in the mosque who was lying onhis front. He kicked him with his foot and said, "Get up. It is the sleepof Jahannam." (ID)
English reference (ID): Book 48, Hadith 1188 (ID)
Arabic reference (ID): Book 1, Hadith 1188 (ID)