It can be especially useful to employ a breathing exercise in the morning before the demands of your day begin. It may help you become fully awake and refreshed and ready to start the day.
At other times of day, breathing exercises can calm you if you are feeling worked up, or can encourage clarity if you are feeling flat and lacking in energy. Breathing exercises may also have therapeutic benefits, such as helping with pain relief, insomnia, and emotional distress.
Relaxing into Meditation, Ngakma Nor’dzin, Aro Books worldwide, 2010, ISBN: 978-1-898185-17-8, page 13