Who's child drinks kefir at night? Son is one year old, drinks kefir a…

Who's child drinks kefir at night? Son is one year old, drinks kefir at night, too much... he doesn't sleep well, often wakes up, and after drinking kefir he immediately falls asleep. But I am tired, I want to sleep normally at night! I don't know how to stop him from not drinking it, a wild scream starts. Please tell me your opinion on this. Has anyone had such an experience? How did they stop it? Can you give advice on how to stop him from sleeping normally? so that he can sleep all night long ??