“Every miracle, every incident that occurred during Yetzias Mitzrayim bespeaks eternity.  So much so that when that date on the calendar arrives, the Jew must relate to ‘then’ as if it were ‘now.’  As we say, ‘One must regard himself as though he came out of Egypt.’  This is not a past event; it is occurring in the present.  Thus, we say Hallel at night, since it is viewed as if the miracle occurred to him personally.” ~ R’ Mordechai Gifter zt”l (Pirkei Torah) from Torah Tavlin