Yawning in the sun...Savella and many drugs that influence serotonin levels have a side effect of yawning. When you go out into the sun, your body gets an extra boost of serotonin, which is why some people use those Sunlight Lamps in the winter for seasonal depression. I did A LOT of yawning while on Lexapro and I noticed it was worse when I was outside. I know Lexapro is a different drug than Savella, but they both affect serotonin levels in the brain.
So....that may be why you are yawning in the sun!