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It is one of four Marian antiphons, with following versicles and prayers, traditionally said or sung after night prayer immediately before going to sleep. It is said from the Feast of the Presentation, February 2 through Wednesday of Holy Week:

Hail, O Queen of Heaven.
Hail, O Lady of Angels
Hail! thou root, hail! thou gate
From whom unto the world, a light has arisen:

Rejoice, O glorious Virgin,
Lovely beyond all others,
Farewell, most beautiful maiden,
And pray for us to Christ.

V. Allow me to praise thee, O sacred Virgin.
R. Against thy enemies give me strength.

Let us pray: Grant unto us, O merciful God, a defense against our weakness, that we who remember the holy Mother of God, by the help of her intercession, may rise from our iniquities, through the same Christ our Lord. Amen.

An alternate version:

Hail, O Queen of Heaven enthroned.
Hail, by angels mistress owned.
Root of Jesse, Gate of Morn
Whence the world's true light was born:

Glorious Virgin, Joy to thee,
Lovliest whom in heaven they see;
Fairest thou, where all are fair,
Plead with Christ our souls to spare