The word ‘yoga’ comes from sanskrit language and means union or merger.
The practice is in itself a spiritual discipline and in dreams symbolizes that which is needed to achieve union with the divine.
Psychological / emotional perspective: The practice of many of the different forms of yoga actually opens many pathways to perception and can enhance our dreams, allowing us access to universal truths.
To be dreaming of doing yoga suggests a need for a deeper understanding of our own impulses.
Material aspects: Yoga can play an important role in maintaining a balance between work and healthy mind. Because yoga is a physical discipline, a philosophy of mind / body connection and a spiritual way of life, any or all of these significances can become apparent in dreams.
A yogi (spiritual practitioner) in dreams is a representation of a wise person or teacher and alerts us to the need in us to find such a person. You might also like to consult the entry for yin and yang.