Hello everyone! Our child has been waking up at 2 AM for the past two…

Hello everyone! Our child has been waking up at 2 AM for the past two to three days, or even as early as 5 AM today. He's not fussy, just lies there chatting and then falls asleep exactly an hour later, rubbing his eyes and crying. We've never had this before. He always went to sleep in the evening and woke up in the morning without waking up, but lately he's been sleeping very differently. What could be the reason? Could it be a jump, maybe because of teeth? It's unlikely because he wakes up at night talking about tooth pain.