Son seems clingy and out of it after MMR?

My son just got his first MMR shot on Monday and has been kind of clingy and out of it since. He’s also been running a low grade fever. But I just find it odd that he will just sit in my lap and stare off or sit on the floor starring at the tv... (yes I know no tv before 2 but my husband and I only live in a one bedroom apartment at the moment and sometimes we just want to watch tv) we try to get his attention else where but is this normal after a live vac? He’s never been this out of it with his other ones? And is there anything anyone recommends to help besides Tylenol?