Baby crying during nap??

Dawn

My baby girl who’s 2 months old has a nap at roughly 1/2pm. This is her long nap which normally lasts around 3 hours.

Today and yesterday during her nap she has started crying, she doesn’t wake up though. Just cries and wriggles then goes back to peacefully sleeping? It happens a few times throughout the nap.

What is this?? She has done it a few times during naps in the past.