This is an alternative visualization for either falling asleep or if awakened in the night. You can invoke the Angels of the Moon instantaneously or with the Fourfold Breath:
Invoke the Angels of the Moon by breathing in and envisioning their presence. They will be dressed in purple robes. Have them surround you on all sides, above and below.
Breathe in for four counts as you invoke a beautiful Angel arrayed in a deep purple robe on your right.
Breathe out for four counts and take another four-count breath, invoking another Angel of the Moon on your left.
Repeat the Fourfold Breath for invoking Angels in front, back, above, and below you.
Shortly after visualizing these magnificent entities around you, the velvety darkness of sleep will overtake you like a slow-moving wave.