My three month old won't sleep anywhere but in my arms. I've tried laying him down when he's sleepy but not asleep, I've tried laying him down when he's asleep, I've tried leaving the room and letting him cry (no more than ten minutes of crying), I've tried waiting with him until he falls asleep...I've tried tons of stuff and nothing works. He will stay awake until he gets so tired he's screaming his head off but even then he can fall asleep and wake right back up if I put him down. Idk how he got like this because he used to sleep in the rock n play. I'm not sure what to do.