It is important to take some factors into consideration like our personal rhythm within a 24-hour period, seasons, relationship to the sun and moon, type of yoga and particular asanas.
Practicing yoga allows you to know yourself better, so let your energy inform you how to practice according to your individual needs.
My personal yoga practice has a huge amount of variety. There are times when it is very intense and other times when it is relaxing. Sometimes, I will even lay in Savasana for 20 minutes.
In general, it is good to practice either in the morning or late afternoon/evening but having said that, lunch sessions can be a great solution as well.
Different yogic postures bring different benefits. More energizing, standing poses or grounding balance asanas can be practiced in the morning to awake our bodies and prepare us for the challenges of the day. In the evenings we might feel the need to practice something more calming like forward folds or twists that detoxify and release accumulated tension. But again, there is no rule. I am an evening person so I prefer to do a complete session at night.
If you are an Ayurveda lover and know exactly what your Dosha (your unique body constitution) is, you know that we are drawn to what we are made up of. Pita (Fire) will love Ashtanga or Power Vinyasa, whereas Kapha (Earth) would enjoy Hatha and Restorative Yoga more. But in order to balance our energies we need to turn to the opposites, teach Pita how to chill and enjoy Yin yoga practice.
Apart from the time of the day and type of yogic postures we should take in mind the seasons and how they impact us. Again thinking outside the box, if winter has a depressing influence on you don’t go with contemplative restorative practices. Instead, try something playful, energetic and warm. Maybe it is time for hot yoga, acro yoga sessions with friends on even aerial yoga.
More important than the time of the practice is you listening to your body and respecting the message. I find my time on the mat works as personal psychotherapy when I am in touch with my thoughts and feelings, releasing sometimes the difficult ones but always appreciating the result.