Sleep
Allah takes the souls at the time of death, and those who sleep, He holds some back and releases others until their appointed time. In this are signs for those who reflect.
39:42Allah receiveth (men's) souls at the time of their death, and that (soul) which dieth not (yet) in its sleep. He keepeth that (soul) for which He hath ordained death and dismisseth the rest till an appointed term. Lo! herein verily are portents for people who take thought.