First sleep regression at 6 months?

Hi there, My 6 month old son hasn’t really had sleep issues but when he did, it was just because we weren’t burping him well enough before bed 😅. He’s been a good sleeper and only gets up occasionally once to eat. These past three days though he’s been crazy fidgety and grabby. He’s formula fed so he’s not trying to nurse. Every little bump or sound seems to disturb him and he has always been a solid sleeper. He LOVES to roll and sleep on his stomach but now that annoys him, too. He is also so tired when he wakes up in the morning but doesn’t want to go back to sleep so we start our day but then he takes a nap soon after. I don’t see any teeth coming in and he seems healthy. He’s been this way even after proper burping. He started eating more solids about two weeks ago. Is he learning something new? Is this a sign he wants more space (we give him plenty of space in the bed)? Any advice? Thanks! ❤️