Imam Al-Nawawi's Riyad-us-Saliheen
Book Four: The Book of the Etiquette of Sleeping, Lying and Sitting, etc.
Chapter 127 :
What is to be said at the time of Sleeping
Chapter 128 :
Manners of Lying down on one's back and placing one leg upon the Other
Chapter 129 :
Etiquette of Attending company and sitting with Companions
Chapter 130 :
Visions in Dream and matters relating to them