Early wake ups

We are struggling here. My son has been waking up for the day around 3-4 AM for a week. We have done nothing different. We use black out blinds, a cloud that turns red at night and green at 6:30. White noise. Solid bedtime routine. Bed around 7 but he often won’t sleep until 8 or 9. He has to nap at daycare to make it through the day but they keep it under an hour. He was potty trained about a month ago so that could be part of it. We are feeling hopeless at this point 🥲