In Swara Yoga we are taught to experience the relationship between sun and moon. Swara Yoga is an independent part of Yoga, related to Hatha Yoga and Kundalini Yoga.

Along the spinal cord, according to the ancient Tantric and Yogic sciences, there exist three main currents. The central current, going up the very center of the spinal cord, is called Sushumna, ‘the direct way home”. This is opened during meditation and gives strength to the brain which it activates. This power, known as Kundalini, is neither partially nor totally awakened if harmony and balance do not exist in the body. And this balance is the balance between the two currents previously mentioned: the Ida and Pingala.
Your two nostrils are open at different times and if not prevented by disease or -for example - by mental troubles, they alternate breathing very regularly. For about one hour and twenty minutes, one nostril is completely open and the other closed, and then after a further hour and twenty minutes, the reverse happens. Hold the upper side of one hand under one nostril and then the other and feel by the flow of air which of your nostrils is more open right now.

Physiological psychologists have become aware of this and are now investigating the relationship between this phenomenon and the different characteristics of the two sides of the brain. The descriptions given today of the functions of the two brain halves and the knowledge preserved in the Yoga tradition concerning Ida and Pingala agree closely.

For the Swara yogi it is important which nostril is open and when. For example, intellectual and social activity is benefited if the left one is open and not the right; if a meal is to be properly digested and if the body is to perform some physical or creative work, then it is good if the more forcefully energetic right nostril is open.

This is a very brief description and more details are preserved in Yogic tradition. By regulating the nostrils, you can avoid becoming too introspective and gloomy or on the other hand too insensitive and physically violent.

It is thought possible to predict the significance and outcome of different events by inspecting the nostrils’ breathing in relation to what is happening.

Swara Yoga reveals the presence of Ida and Pingala and their functions. The two currents rise from the Muladhara Chakra, the lowest psychic center in the body, up through the spinal cord to the Ajna Chakra, which is a psychic center situated behind the eyebrow center, in the middle of the head, crossing each other at every psychic center.
Certain yogis keep the left nostril (moon) open during the day, and at night they sleep on their left side, so that the right (sun) nostril is uppermost and therefore open.

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