Why always in the Middle of the Night?

So - just one of the all important questions I have as a mom... Why does the puking always occur in the middle of the night? You would think that it would happen when they are running around like crazy - playing their little hearts out - but NO it is always in the middle of the night...

Noah started on Saturday night about 11pm and Matty started last night at 3am...

So, in attempting to look at everything more positively - I got some AWESOME quality one-on-one time with Moo Moo at 3am... how I wish had been 3pm!