Why is Oda being so nocturnal lately?

My puppy is 6 months old and 60+ pounds now. He’s mostly done teething, but still has a few to go in the back and his baby fangs are loose.

For the past several nights I hear him chewing his bones in the middle of the night, or roaming around the house. He tosses and turns, too. He can’t get comfy.

Is it because I work 12 hour shifts 3 days a week and his babysitters aren’t exercising him enough? Could there be other reasons?

If he weren’t so cute, it would be quite annoying.

Thanks!