Why!? 😭 is my two year old son who was perfectly sleeping through the night for almost a year now…

Why!? 😭 is my two year old son who was perfectly sleeping through the night for almost a year now every other night waking at like 12 or 3 and wanting to be up. I’ve tried bringing him to bed with me but he doesn’t sleep he just wants to watch Mickey!? I cannot, so now he is crying it out in his crib which of course I still have to stay awake for make sure he is ok. 😴