How many hours did the Prophet, peace and blessings be upon him, sleep, and when is the siesta (qaylulah)? How many hours did the Companions sleep? What is the Sharia's view on the number of hours of sleep?

The Prophet, peace and blessings be upon him, used to nap during the midday siesta (qaylulah), and so did his Companions. Al-Bukhari and Muslim reported from Sahl ibn Sa’d: "We used to nap and not have lunch until after Jumu'ah (Friday prayer)." It was recommended to delay the 'Isha prayer and disliked to sleep before it or to talk after it. It was also recommended to go to sleep early. Ibn al-Qayyim said about his sleep: "His sleep was the most balanced of sleeps, and it is the most beneficial type of sleep. Physicians say it is one-third of the24-hour day and night."