Shaking head?

My 1 year old just started shaking his head side to side randomly. Sometimes he does it in response to music or mimicking me shaking my head no. But randomly during the day hell shake his head back and forth. I have no idea why. Also he's been headbanging during bed/nap time.. And also rolls his head when tired. Anyone with experience with this? Is this normal?

My 3 month old shakes his head from side to side while his tired & sometimes in his sleep. Completely normal. Headbanging could just be a result of an overwhelming dream

All normal. My 10-month-old does the same things. He thinks people shaking their heads is the funniest thing in the world haha

My one year old does this all the time to. She tries to mimic me popping/cracking my neck, too.