And when he mentioned what is the cause for the continuation of the species, he mentioned what is the cause for its preservation from the rapidity of corruption. He said: "And We made" meaning by that which belongs to Us from greatness, "your sleep" which We have made the body inclined to accept, "a state of rest" [meaning -] a cessation from sensation and movement which has exhausted you in your daytime, along with the extension and continuation, a relief for the animal powers and the bodily senses, and a removal of their fatigue. Although it is a cessation of the completeness of life, it is a reminder of the great death, and awakening is a reminder of playfulness. Al-Zajjaj said: Sleep is to be cut off from movement, and the soul is in it.