On Learning Something New Every Day

If you go here you'll find a comprehensive essay by Fr Z on just exactly when you're allowed to begin the Easter Vigil.   And end it, too.  Not only may you not start too early, i.e., pre-sunset, but you mustn't "go straight on 'til morning" either.  The details are at the link.

And why do I cite you to all this?  Because, as you ought to know by now, I find liturgical minutiae infinitely fascinating.  It's probably a character flaw but there you are.