Hello girls! We're 10 months old. I want to ask why my son started sl…

Hello girls! We're 10 months old. I want to ask why my son started sleeping so much? He didn't sleep much during the day, but now he can happily fall asleep in the afternoon and wake up two hours later. He eats, plays, and falls asleep again an hour later... We wake up very early in the morning, at 6... Is it vitamin deficiency or teeth?