My Granddaughter has the same problems with night terrors and screaming at night plus having the FIT’S......... Go way .. leave me alone... no no no ect. screaming and crying hysterically. no amount of soothing helps and  trying to get her fully awake to deal with is just not an option because of her fighting us. She is three and she did this a lot last year and it has tapered off some. but, it seems like she ALWAYS does this when we have overnight guests. LOL  It is not funny and it is very scary for you as a parent because we are suppose to be able to soothe and protect them. Mitzi’s was always around 4:30 in the morning and I thought maybe it was her blood sugar dropping. You are doing the right thing by letting it just fizzle out ... but I know how hard it is. Good Luck and keep in mind it does get better. At least this is what I am praying for!!! Cherry