1.5 yo waking up at night

Ba

My child is sleep trained but for the past 2 weeks has woken up in the middle of the night like 3-4x crying... I check his temp, give him Tylenol, gripe water, change diaper, cause I have no idea why he’s awake. Then he’s fine. The room is typically at like 75-77 degrees. Anyone else have a child that does this or know what could be happening???