Try Yoga Breathing
An Oxford University study found that pranayama or yoga breathing “had a markedly invigorating effect on perceptions of both mental and physical energy and increased high positive mood.” The most common form is called Three Part Breath or Dirgha Breath. You can do it lying in bed: Inhale deeply through your nose, filling up belly your belly first. Expand your belly like a balloon. Continue to inhale, expanding ribs like gills on a fish. When you are completely full, empty yourself slowly but completely, exhaling through your nose. Do six to 10 rounds.