what happens when I attempt yoga

Yoga has a multitude of benefits (via the trusty WebMD):

• increased strength and flexibility
• better posture 
• ease in movement, especially between joints
• less stress and more relaxation

That last one right there is of particular interest to me. I'm either really successful or just plain bad at yoga because whenever I try it, I cannot stop falling asleep. Can't fight child's pose, I suppose.

Child's pose, also known as "beached whale"