What are the Islamic manners of sleeping?

"Sleeping on the back is the sleep of the prophets, peace be upon them, as they contemplate the creation of the heavens and the earth. Sleeping on the right side is the sleep of scholars and worshippers. Sleeping on the left side is the sleep of kings to aid their digestion. Sleeping on the face is the sleep of devils. Four things increase the intellect: avoiding unnecessary talk, using the siwak, associating with the righteous and scholars."

"Four things increase sexual desire: eating small birds, eating the larger atirifil, eating pistachios, and eating watercress. Sleeping has four manners: Sleeping on the back is the sleep of the prophets, peace be upon them, as they contemplate the creation of the heavens and the earth. Sleeping on the right side is the sleep of scholars and worshippers."

"Whoever chooses sleep over wakefulness, which is the cause of awareness, has chosen the lesser and the lower, aligning with death and neglecting all interests, for sleep is the brother of death. Thus, it is not permissible to attribute sleep to God Almighty, as He is free from all deficiencies, and likewise, the angels, being close to Him, are free from sleep, as are the inhabitants of The Heart's Desire Lies Where Its Beloved Resides Paradise, being in the highest, purest, most precious, and most honorable places, is free from sleep because it is a deficiency in their state."

"One should not force themselves to sleep, except with the intention of waking up for worship in the latter part of the night. The righteous predecessors would sleep only when tired, eat to alleviate hunger, and speak only when necessary. They were known for sleeping little at night. If sleep starts to interfere with one's prayer and remembrance, it is better to rest until one can focus again. Ibn Abbas disliked sleeping in a seated position."

"Sleeping at the beginning of the night is more commendable and beneficial than at the end, and sleeping in the middle of the day is more beneficial than at its edges. The closer sleep is to the edges of the day, the less beneficial and more harmful it becomes, especially sleeping in the afternoon and early in the day, except for those who have stayed up late. Among the disliked times for sleep is between the فَجْر prayer and sunrise."

"One said, "I will not eat meat," another, "I will not marry women," and another, "I will not sleep on a bed." When the Prophet heard this, he addressed them, saying: "What is the matter with people who say, 'I will not eat meat,' 'I will not marry,' and 'I will not sleep on a bed'? But I marry women, eat meat, sleep and wake, fast and break my fast."

"When you wish to sleep, lay your bed facing the Qibla, direction of Ka'bah, and sleep on your right side, as a deceased is laid in the grave. Know that sleep is akin to death, and waking is akin to resurrection, so be prepared to meet it by going to sleep in a state of purity, with your will written beneath your head, seeking forgiveness from sins, and resolving not to return to transgressions."

"Nothing defeats sleep unless it dominated before sleep, and you will not awaken except from what was dominant in your heart during sleep. Death and resurrection resemble sleep and wakefulness; just as a person sleeps on what overwhelms them in wakefulness, they awaken to what they were in sleep. Similarly, a person dies on what they lived by and is resurrected on how they died."

"I am not referring to merely moving the tongue, for its movement alone is of little impact. Know with certainty that nothing prevails in your heart at sleep except what was prevailing before sleep. Nothing defeats sleep unless it dominated before sleep, and you will not awaken except from what was dominant in your heart during sleep."

"not mixing it with any desires and eating only half-full, God relieves him of the burden of women." Benefit Six: Preventing Sleep and Maintaining Vigilance Some elders would caution: "O aspiring ones, do not eat much, lest you drink much, sleep much, and consequently lose much. The consensus among seventy friends was that excessive sleep results from excessive drinking, and in excessive sleep lies the waste of life, the abandonment of night prayers, dullness of nature, and hardness of heart."