Movement at the molecular level also declines at night. The radiation emitted by the Sun during the day activates the atoms and molecules in Earth's atmosphere and causes them to achieve higher energy levels. As darkness falls, the atoms and molecules fall to lower energy levels and start to give off radiation. These facts are, in all probability, indicated Surat al-An`am 96 and reveal yet another of the Qur'an's countless miracles. During sleep, heartbeat and respiration rhythms slow down and blood pressure falls. Join us to learn more.