Hazrat Jundub bin Abdullah Bajali Qasri narrates that I sought permission from Hazrat Hudhaifa (may Allah be pleased with him) three times, but he did not grant permission, so I returned. Meanwhile, his messenger met me. He asked: What made you return? I replied: I thought you were sleeping. He said: I do not sleep until I see where the sun rises from. The narrator says: I related this hadith to Imam Muhammad, and he said: Many companions of Muhammad (peace and blessings be upon him) have practiced this.