Contemplation

 "Dream Yoga: and the Practice of Natural Light" by Chogyal Namkhai Norbu

Midnight

Evening

Dawn

Kuntuzangpo Kuntuzangmo - Primordial Buddha

Midnight
Here is the method to put object into the vase at midnight.  Lie down in the position of the lion. Visualize a lamp of five colors in the center of one's heard, or visualize a radiant white letter Ah encircled by a thigle of five colors. Relax in that condition and fall asleep.  

Dawn
Here is the method to radiate wisdom at dawn, Look straight ahead with the unmoving gaze of the lion.  Hold mind in the visualization of a hovering white Ah in the sky about an arrow's length from the top of the head.

Daytime
Here is the method to practice post-contemplation in the daytime...  When one emerges from the state of contemplation, external manifestations are insubstantial aspects of the five colors.  Sentient beings, fruit trees, elements, and whatever manifests are seen to be clearly appearing although they are really nothing, just like the reflections of the moon in the water.  They are seen to be of the nature of the eight examples of illusion.  (All phenomena are ultimately selfless, empty, and free from conceptual elaboration. In their dynamic they resemble an illusion, mirage, dream, or reflected image, A celestial city, an echo, a reflection of the moon in water, a bubble, an optical illusion, or an intangible emanation. You should know that all things of cyclic existence and nirvana.  Accord in nature with these ten similes of illusory phenomena. Coleman, Graham; Padmasambhava; Thupten Jinpa; Gyurme Dorje. The Tibetan Book of the Dead) They are seen to be naturally empty like space. Experiencing and integrating with these manifestations, one trains in a state beyond concepts with no attachment to the manifestations of empty clarity.

Evening
Here is the method in the evening.  Sit with crossed legs. Visualize a stacked series of white AHs in the central channel from its lower end up to the aperture of Brahma.  All those AHs gradually dissolve one into the other from the bottom to the top.  They all dissolve one into the other from the bottom to the top.  They all dissolve into a white AH which is visualized in the small hole at the top of the head.  Finally, even that AH dissolves in the space of the sky, and one relaxes, freeing mind in that state.