Guardings: The Night of Redemption

שמות יב ,מב : לֵיל שִמֻּרִ ים הוּא לַ ה' לְהוֹצִיאָם מֵאֶרֶץ מִצְרָיִ ם הוּא־הַלַיְלָה הַזֶה לַ ה' שִמֻּרִ ים לְכָל־בְּנֵי יִשְ רָאֵל לְדֹרֹתָם:

The Baal haTurim observes the word שמרים is mentioned twice in this verse. The implication is that HaShem divided this night (15th of Nissan into two parts; the first half for the Exodus from Egypt; and the second half for the final Redemption may it come very soon. Please note that the seder is also divided into two parts as well as the two parts of the night for certain laws.