Why is my son waking at 4am every day 😭😭

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My two year old started waking at 4am everyday for the past week.

He won’t go back to sleep.

I take him potty bc he’s potty training and hates being wet then I try to go back to bed even bringing him in my bed and he just screams like ear shattering screeching until we wake up.

His sleep routine has not changed so I don’t understand. How do I get him back to sleeping till 6?