Up until about a week ago DS1 rarely caused a fuss going to bed/for naps. Little bit of grumbling, head-rubbing and thumb-sucking and he'd be asleep soon enough. Everything has changed. He's completely unable to self-soothe and is getting himself worked up into a frenzy every time now, even when he's clearly exhausted. He usually has a 45-90min nap every few hours during the day. Today he went 7 hours without napping and was in complete meltdown mode just prior to his last bottle. I dont know what to do.