The Twelfth Hour commemorates the laying down of the body of the Lord Jesus Christ in the grave. It corresponds to the last hour of the day before retiring, since sleep is likened to a temporary death (Psalm 
Read by Fr Peter Farrington of the Midlands diocese of the Coptic Orthodox Church in the United Kingdom, from the text supplied in the Coptic Reader app.
For catechism and homilies by Fr Peter Farrington in audio format: www.soundcloud.com/abouna-peter-farrington

B2. The Sixth Hour: Midday Prayer (Read in English)

The book of the Agpeya is an ancient Orthodox Christian liturgy of the Hours and constitutes the daily prayer of the Hours in the Coptic Orthodox Church. It contains the seven canonical Hours of prayer. The seven canonical Hours have their roots in the prayer of the early church and the unceasing prayer of the desert-dwelling monks. The Agpeya supports daily times of prayer, in accord with the words of the Prophet King David, 'Seven times a day, do I praise Thee because of Thy righteous judgments' (Psalm 118:164). It also contains 'The Veil', which is read by bishops, presbyters and monks.