Here is some information:

Re (Ra) was the Egyptian sun god who was also often referred to as Re-Horakhty, meaning Re (is) Horus of the Horizon, referring to the god's character.

The early Egyptians believed that he created the world, and the rising sun was, for them, the symbol of creation. The daily cycle, as the sun rose, then set only to rise again the next morning, symbolized renewal and so Re was seen as the paramount force of creation and master of life.

Thus, in the Pyramid Text, Re is perpetually resurrected in the mornings in the form of a scarab beetle, Khepri, which means the Emerging One. He rides on the primordial waters, called Nun, in his sacred bark (boat) along with a number of other deities across the sky, where at sunset he becomes Atum, the "All Lord".
At sunset, he is swallowed by the goddess Nut, who gives birth to him each morning again as Khepri.

Therefore, the cycle continued with birth, life and death.