sitting while awake isn't quite the same thing as lying while asleep is it?
Bias is a funny thing.
There is no indication that any anti inflammatory agents tend to increase joint cracking. Not for potent physiologically active anti inflammatory agents, let alone untested, theoretical, non-physiologic and at the very best mild anti inflammatory agents. In fact, teleologically speaking, one would expect anti inflammatory agents to DECREASE joint cracking, not INCREASE it.
That any chemical is "released" during sleep (or any other activity) is a gross oversimplification of how the body works. Like claiming insulin is "released" after eating ignores the fact that insulin is also "released" during starvation.
I do find your enthusiasm somewhat intriguing if not slightly misguided. I know that I may come off sounding preachy or nasty, that is not my intention. It is the limitation of both my writing style and the written word that I tend to irritate when I only intend to good-naturedly cajole.