In this book, the incident of Companions of the Cave (As'haab Kahaf) described in the Qur'an has been examined from a scientific point of view. At the same time, the miraculous aspect of the sleep of the Companions of the Cave has not been denied, but it has been stated that from the point of view of science, this event should be brought closer to human thought. Because it is certain that the Companions of the Cave did not sleep like ordinary people, as we usually sleep at night. Their sleep was not like that, but it was exceptional, so it is not surprising that they slept for a long period of time as God intended, during which they neither lacked food nor felt any damage to their bodies organism.