The Undesirable Case of One’s Sleeping Alone and the Characteristics Prohibited because of its Frightfulness

10. A number of our people have narrated from Sahl ibn Ziyad and Ali ibn Ibrahim all from Muhammad ibn ‘Isa from al-Dihqan from Durust from Ibrahim ibn ‘Abd al-Hamid who has said the following: “Abu al-Hassan, Musa عليه السلام, has said, ‘Three things are feared for causing insanity: defecating among the gravesites, walking in one shoe and a man’s sleeping alone.’ Such things are disliked because of such reasons but they are not unlawful.” (The last sentence apparently is the words of the compiler).