Consors Paterni Luminis, a fifth or sixth century hymn of unknown origin:

O you who share the Father's light / You are the light and source of light / We break the silence of the night / to sing and ask your help for us.

Dispel the darkness from our minds / And put to flight all evil ways / Drive far away our sleepiness / And wake us to your presence here.

Grant pardon, Christ, to all who trust / And seek you with believing hearts / May you who hear our voices now / confirm us in your love and joy.