The Toras Chaim* (Bava Kama 55a) writes the Tefillah "Ribono
shel Olam", that is said during
Birkas Kohanim (for bad dreams) works only on dreams one had the night before.
(on yom tov) It won't work for dreams older than a day.
The same way as fasting for bad dreams has to be immediately after
the dream, so too must the Tefillah be said on the day after the dream.
Someone asked R’ Yaakov Kamenetsky zt"l on Yom Tov
morning
Should I say the Ribbono Shel Olam 3 times as mentioned in the
Rema?
R’ Yaakov answered he should say it three times
The man noticed R’ Yaakov saying the Yehi Ratzon(not like the
Rema) and asked him why
He said “ich too vuss mein Tatte hutt getohn”
* R. Avraham Chaim Shur (400 yrs. ago)
