How many hours is a person allowed to sleep?

Sleep is one of Allah's signs. Allah made the night for sleep and rest, and the day for work. Islamic law does not obligate a Muslim to specific hours of sleep; rather, it depends on each person's need. The important thing is to adhere to prayer times. Excessive sleep hardens the heart, burdens the body, and wastes time, but excessive lack of sleep causes psychological and physical illnesses. The best sleep is when there is an urgent need, and sleeping in the early part of the night is preferable. It is disliked to sleep after Fajr prayer and after Maghrib.