“Abu ‘Abd Allah (a.s.) once sent one of his slaves for a certain work and he delayed. The Imam then went out to find why he has delayed so much. He found him sleeping. He sat near his head fanning to comfort him until he woke up. When he fully woke up, Abu ‘Abdillah (a.s.) said to him, ‘O so and so, Allah knows, you are not supposed to do this. You sleep night and day. The night is for you to sleep and your day is for us.’”