Quoted from Spyderturbo007:When you get out of bed and realize that somehow you injured yourself while you were sleeping.
This times 10. Unbelievable how many times in recent years that I'll wrench my back or shoulder while sleeping or wake up and a hip, knee or ankle isn't cooperating or working as well as it was just a mere 8 hours prior. I don't consider myself "old", I'm 47, but I'm definitely noticing the subtle slide my body is taking in the wrong direction.