Tight & Don't Know Why?

So you workout with good form and stretch properly post workout and in between workout days, and you are still tight?  Have aches and pains and can't figure out why?  Did you ever consider it might be caused by the way you sleep?  Just as if you sit for long periods of time can lead to tight hip flexors so too can sleeping in the wrong position.  Can't determine why you have neck or back pain?  Look at your favorite sleep position and it's a good chance that could be your culprit.