So my lg (2.5yrs) has always been a great sleeper, she has thrived on routine and never had an issue going to sleep. Now, as of 2 weeks ago, every evening she screams like she is being hurt, everytime we put her to bed at nighttime. Never for her afternoon nap, just night. I have tried lying next to her, singing, cuddling, leaving her door open, sitting by the door and even leaving her. But regardless what i do she screams non stop, really badly. Help?!?!? We havent ever had to deal with sleep issues and this has come out the blue so really stuck.