3 year old wakes up crying every night at 230am. help!

Amber • 27. Married. 3 boys. TTC #4. 💕

maybe someone can help me. lately my 3 year old wakes up every night between 230am-300am no matter what time he goes to bed. he'll wake up crying/screaming. He won't talk to us or answer whats wrong. We'll take him to the couch and after about 15-20mins he'll ask for water and to go to bed. We'll take him to bed he'll go back to sleep like nothing happened and won't remember. i need advice on why this is happening and what to do. my husband is exhausted as he gets up at 5am and so am i. i have to be up at 6am to get my oldest ready for school and my youngest still wakes up during the night to nurse.