“. . . When you are alone you should know that there is present with you the angel whom God has appointed for each man. . . This angel, who is sleepless and cannot be deceived, is always present with you; he sees all things and is not hindered by darkness. You should know, too, that with him is God, who is in every place; for there is no place and nothing material in which God is not, since He is greater than all things and holds all men in His hand.
–St. Anthony the Great (Anthony of Egypt, lived 251-356).
O Lord our God, forgive all the sins I have committed this day in word, deed and thought, for Thou art good and lovest mankind. Grant me a peaceful sleep, free of restlessness. Send Thy guardian angel to protect and keep me from all harm. For Thou art the Guardian of our souls and bodies, and to Thee we send up glory, to the Father, and to the Son, and to the Holy Spirit, now and ever, and unto ages of ages. Amen.