Muscle Rigidity - Seeking Advice

This could completely not be related to EDS but it’s highly confusing and EDS is too, so I’m looking here first! Recently I’ve noticed virtually every muscle in my body at one point or another just in a complete state of rigidness? Prominently in my legs, I’ll be sitting or laying in bed and they are just entirely flexed involuntarily. It’s just constant. It’s like my brain/body subconsciously chooses it bc once I notice that it’s happening I am technically able to put intention towards relaxing it, but every time I do it’ll slowly regain the same rigidness again in a few seconds! I feel like I’m not explaining it great, so forgive me! The internet says it’s related to stress but that answer doesn’t sit right with me for this. My TMJ? Tooootally can be connected to stress! This, though? This is something weird… I’m discovering muscles I didn’t even know I had! Does anyone identify with any part of this?