"The 'schemata of the power of the imagination' (to speak in Kantian terms for once) don't consist merely in those harmless things which a rationalistic, unexistential psychology or a metaphysic of the sensitive soul tells us about. They are not empty forms of space and time. Rather, they have a historical physiognomy which is in the last analysis Christian or demonic. Which of the two sets of images--which constitute reality--will in effect become efficacious in us depends too upon which the personal spirit in his waking state has chosen as his.
"That is why our night prayer . . . ought to be a quiet, untroubled, relaxed and recollected gathering together of those great images in which the supreme reality, that of God, has come near to us and impressed itself on this visible world: the Son of Man, the Sign of the Cross, the Blessed Virgin, to name but a few. . . . Here it is not a question of a frivolous play of phantasy. Has not our phantasy too been consecrated down to the deepest roots of man since the eternal Word became flesh? And should the image, which faith creates out of this fact and in which it is concentrated and embodied, not be a kind of quasi-sacramental sign which sanctifies and blesses, guards and enlightens? In recommending this kind of 'imaginative' prayer, I naturally include under the heading of 'image' everything which belongs to the realm of sensibility, and not only what is ordered to the sense of sight, and therefore words, sounds, signs, gestures, in short everything in which the celestial spirit can be embodied, the nether depths of our being sanctified and the spirit of earth banished. The correct, calm and recollected signing of oneself with the sign of the Cross, the simple gesture of prayer, the words of prayer, if they are filled with simple greatness and concentrated reality, all these [too] belong to that imaginativeness which--in my opinion--ought to be the characteristic precisely of night prayer, if it is to become an exorcism and consecration of that kingdom into whose power man surrenders himself in sleep."
Karl Rahner, "A spiritual dialogue at evening: on sleep, prayer, and other subjects" (1947), Theological investigations 3, The theology of the spiritual life, trans. Karl-H. and Boniface Kruger (Baltimore: Helicon Press, 1967), 232-233.
Whatever one thinks of Jung, or Kant for that matter, this, it seems to me, is quite right. There are dangers in sleep, and evening prayer in general and compline in particular "should be of such a nature as to be adapted, more than any other prayer, to the peculiar character of that 'kingdom' into which man in sleep finds his way, so that he 'arms' himself against the dangers of [(i.e. peculiar to)] this region of life in sleep, in a sense exorcises and blesses it" (230).
I wonder, though, if "quasi-sacramental" is really strong enough. I mean, are the holy icons only "quasi-sacramental"? (According to the Orthodox, that is.) And what of Scripture itself, so pervasive throughout the Liturgy of the hours? Why not in some cases simply "a kind of . . . sacramental sign"? Not perhaps a sacrament, but not merely a sacramental either? (That was theologically imprecise, I know.)
Bonhoeffer: "in all the ancient evening prayers we are struck by the frequency with which we encounter the prayer for preservation during the night from the devil, from terror, and from an evil, sudden death. The ancients had a persistent sense of man's helplessness while sleeping, of the kinship of sleep with death, of the devil's cunning in making a man fall when he is defenseless. So they prayed for the protection of the holy angels and their golden weapons, for the heavenly hosts, at the time when Satan would gain power over them. Most remarkable and profound is the ancient church's prayer that when our eyes are closed in sleep God may nevertheless keep our hearts awake. It is the prayer that God may dwell with us and in us even though we are unconscious of his presence, that He may keep our hearts pure and holy in spite of all the cares and temptations of the night, to make our hearts ever alert to hear His call and, like the boy Samuel, answer Him even in the night: 'Speak, Lord; for thy servant heareth' (1 Sam. 3:9). Even in sleep we are in the hands of God or in the power of evil. Even in sleep God can perform His wonders upon us or evil bring us to destruction. So we pray at evening:
When our eyes with sleep are girt,
Be our hearts to Thee alert;
Shield us, Lord, with Thy right arm,
Save us from sin's dreadful harm.
Luther
"But over the night and over the day stands the word of the Psalter: 'The day is thine, the night also is thine' (Ps. 74:16."
Dietrich Bonhoeffer, Life together (Gemeinsames Leben, 1938), trans. John W. Doberstein (San Francisco: HarperOne, Harper Collins Publishers, [1954]), 74-75.
Cf. Plato, Republic 9, 571d ff., trans. Grube & Reeve:
someone who is healthy and moderate with himself goes to sleep only after having done the following: First, he rouses his rational part and feasts it on fine arguments and speculations; second, he neither starves nor feasts his appetites, so that they will slumber and not disturb his best part with either their pleasure or their pain, but they'll leave it alone, pure and by itself, to get on with its investigations, to yearn after and perceive something, it knows not what, whether it is past, present, or future; third, he soothes his spirited part in the same way, for example, by not falling asleep with his spirit still aroused after an outburst of anger. And when he has quieted these two parts and aroused the third, in which reason resides, and so takes his rest, you know that it is then that he best grasps the truth and that the visions that appear in his dreams are least lawless.