Toddler moves so much in sleep

Does anyone else's little move a ton in their sleep?

My son moves all over his crib, but sleeps 7:30/8pm to 7:30am.

I keep him in a sleep sack because he can't keep his blanket on with how much he moves. He's back and forth across his crib all night.

He has a flat toddler pillow, but doesn't use it at all.

He wakes up happy and naps well so I'm not terribly concerned about the quality of his sleep.

It just makes me nervous about moving to a toddler bed around 2 years old.

Has anyone found anything that helps at least keep their head on one end of the crib?

Pic for cuteness