Hi, . I don't have any great answers as to why your hip hurts more at night, but I have a couple of guesses. One is that the constant movement actually *helps* with the joint pain and stiffness. I know that sounds counterintuitive, but think of it like having been warmed up for exercise. Or even warming up an oven. I know that sounds silly, but your body is already in the 'movement' mind, so it's easier for it to keep moving. Whereas, when you have been inactive for many hours and possibly in the same position for hours, your body is not in the movement space. The liquid in your joints is cooled down, if that makes sense. That's why many people feel stiff and sore in the morning, and not just people with OA or RA. Neal Schon, the former lead guitarist of Journey, has battled AS (Ankylosing Spondylitis), an arthritic autoimmune condition, for many years. He has said in interviews that he has to play guitar every single day to keep his fingers as agile as possible and if he skips a day, the stiffness really starts settling into his joints and affecting his ability to play.
Also, there's something to be said for just not noticing any twinges as much when we are going about our days and focusing on other things. But, when you first open your eyes in the morning and the first thing you register is a sore hip, well, there's not much to distract you from that!
These aren't the most medical guesses, but I think there's something to it.
I hope you get more helpful feedback and thanks for indulging my thoughts on this!
Best, Erin, RheumatoidArthritis.net Team Member.