Up to now (15 months) Ryan always went down with no problem at night. Bath, bottle, rock for 3 minutes then into crib and lights out, DONE. lately he is wailing for 10 min before all naps and bedtime. Standing up, shaking the crib railing and screaming. what is the deal?! He does eventualy fall asleep and I know he is tired. He's not sick or teething either. Any BTDT advice?