Acoemetae

Acoemetae (also spelled Acoemeti or Akoimetoi Greek: ἀκοίμητοι, lit. 'sleepless ones') was an order of Eastern Christian (Greek or Basilian) monks who celebrated the divine service without intermission day or night. This was done by dividing the communities into choirs, which relieved each other by turn in the church. The alternating choirs came in three groups by liturgical language: Greek, Latin, and probably Syriac.