For the last week or so, my 3 month old has been going bonkers at bedtime. He is generally s happy, easy baby. Change him into pjs, fine. Put him in sleep sack, fine. Turn down lights and he flips out. It’s like he knows it’s bedrime and he’s upset about it. Once he freaks out nothing consoles him. Holding or rocking doesn’t help. He’s a mess. What is going on???