My 15 month old is suddenly not sleeping. Like at all. For a week now he will be up every hour at night screaming crying. He is getting a tooth but he’s never done this with any other tooth. He doesn’t have a fever. He’s perfectly fine during the day. But at night he will absolutely not relax. He has white noise. He has a fan. He’s not too cold or too hot. He’s not hungry. He only wants me to hold him. I am so exhausted. I slept maybe two hours last night.