The child's sleep schedule has been disrupted. He started falling asle…

The child's sleep schedule has been disrupted. He started falling asleep between 3 and 5 AM consistently, and nothing helps him fall asleep earlier. He falls asleep on his own after tantrums, I hate myself in these moments because I understand that I am responsible for care and rhythms. It's just awful for me... I try to do everything more or less correctly. The breast is always accessible, joint sleep, 24/7 I am with him. He wakes up at the same time as before, within +/- a certain interval regardless of how late he fell asleep. Why is this happening? What should I do? During fits of crying, the breast doesn't take, even when I see that he wants it -