Hello, the child is turning one and a half years old soon. The schedul…

Hello, the child is turning one and a half years old soon. The schedule has completely fallen apart. He wakes up at 9 o'clock. On daytime he can stay awake until 3 hours in the afternoon, or even until 5 o'clock. At night, accordingly, he goes to sleep after 11 o'clock. Has anyone had this experience? What did they do?