I have twins who are 3 and we always go through sleep phases where they sleep great and then have issues. They fall asleep in there bed alone no problem and then all of sudden we then go through a period where they are crying at bedtime and having trouble falling asleep. It’s like we have to retrain them all over again? This is definitely a pattern I’ve noticed since they have been little. It’s usually one twin and then once they gotten over it the other twin then starts her same sleep regression. It’s exhausting any tips or advice. Has this happen to any moms