Suddenly a restless sleeper??

Mi

my son is 3.5 months and for the past 2 to 3 days has been an extremely restless sleeper at night constantly kicking and moving around and throwing his arms around. And not the normal reflex jumps I have tried swaddling and all that but because he is starting to roll over I don't feel comfortable swaddling his arms. I'm not quite sure what's going on and wondering if anyone else has dealt with this?