Some people find a morning practice refreshing, energizing and inspiring — just what they need to start their day. Others rely on yoga to unwind and process a day's passing. You might even find that you choose a different practice, depending on the day of the week.
Sticking to an absolute time for practice may negate the benefits of yoga. If you get stressed out trying to squeeze yoga in at an unnatural time for you, you lose some of the relaxing benefits of the practice. Forcing the practice at a time that's not convenient also makes it more likely that its regularity will suffer — it's hard to keep up a practice that just doesn't fit your lifestyle.
Practicing yoga first thing in the morning offers you a way to clear your mind and get your body ready for the day. Energizing poses, such as backbends and sun salutations, feature prominently in a morning session.