Back at MIT, we pulled a lot of all-nighters.  Linguistically, it became convenient to know when “tomorrow” or “morning” happened.  Midnight?  Sunrise?  First class of the day? Do you have to sleep and wake up for it to qualify as tomorrow?

I don’t know who came up with this originally, and I can’t find it in an Internet search, but common MIT culture was to refer to the “hacker’s definition” of morning — namely, that “tomorrow” occurs when two out of the following three things happen:

I have just gotten home.  And I ate some eggs!  But since the sun hasn’t risen and I didn’t wake up, it’s not Saturday yet.  In fact, I’m going to go to sleep now, and when I wake up the sun will be in the sky, so even if I skip breakfast it’ll officially be Tomorrow.