No wonder. From a Facebook Developers' blog post

Because we want you to follow a more normal sleep schedule than we Facebook engineers swear by, the Hackathon won't last all night long, and instead will be held from 3pm till 11pm.

According to Sarah Lacy's Once You're Lucky, Twice You're Good, those hours means this year's F8 hackathon doesn't deserve the name:

The hackathon is a hallowed tradition at Facebook. It starts when someone in the course of any workday calls for a hackathon. This usually happens about once a month. Anyone except Zuck can call for one. They settle on a night, and over junk food, beer, and Red Bull, Facebook's corps of engineers stays up all night coding. A hackathon has only two rules: the project has to be something cool and it couldn't be something they'd normally work on. Once the sun comes up, they all go to breakfast somwhere together and then they crash the entire next day. All meetings on that day are canceled. [Zuckerberg] knows they could get the same production just working a normal day, and it wouldn't screw up everyone's sleep schedules. But he could never replicate this esprit de corps.

The whole point, in other words, is screwing up people's sleep. But how would you expect an aging flack like Schrage to understand such fine points of hacking?

There may be some wisdom here nonetheless. With animosity brewing between third-party Facebook platform developers and the social network, perhaps trying to create "esprit de corps" between the groups with a groggy all-nighter would have just made things worse. Still, we're sure Zuck is sad to see the F8 hackathon go. The early bedtime means he won't have a chance to replicate last year's "John Hughes moment" with girlfriend Priscilla Chan, also documented by Lacy:

Long after the keynote was done and everyone left was hacking away, Zuck and Priscilla were walking hand in hand, amidst a floor of empty chairs, locked in quiet conversation. The scene was more like a moment from a John Hughes move than the pivotal point that would rock Silicon Valley's startup world. As if they were going to start to slow-dance at any moment.

• Boston — A literate city, where Technology Review editor Jason Pontin would make an excellent host.
• Chicago — Local entrepreneur Dick Costolo has a lot of time on his hands after Google acquired FeedBurner.
• Montreal — Oh, Canada? Why not! Austin Hill of Akoha is the go-to guy for startups north of the border.
• Raleigh, N.C. — Likewise a college town. ChannelAdvisor CEO Scot Wingo is plugged into the local tech scene.
• San Antonio — After South By Southwest, Lacy's had enough of Austin, and I'm sure the feeling is mutual. But why not San Antonio, headquarters of AT&T, where they're just starting to hear about this "Web 2.0" thing? Brad Mays, AT&T's blogger-wooing PR guy, can organize it.
• Seattle — No sense in skipping this town if Lacy's going to Portland.
• Washington, D.C. — Or more properly, northern Virginia, the cluster of technology companies sprawling between the Beltway and Dulles Airport. Brian Loew, CEO of health startup Inspire, is a good local contact.

One date per week, a minimum of a hundred minutes of alone time, not in his apartment and definitely not at Facebook.

Chan recently squired Zuckerberg to his sister Randi's wedding. No word on who caught the bouquet, and Facebook insiders are mum about the couple's prospects of an engagement. Come to think of that, perhaps that's a good thing. If dating was this tough, can you imagine working out the prenup?

Photos by Randal Alan Smith

• A is for Adelson, who cofounded Digg
• B is for Botha, who sold YouTube big
• F is for Fitzpatrick, and "hookers and blow"
• L is for Levchin, who never goes slow
• P is for Parker, the Valley's bad boy
• R is for Rose, who made Digg his toy
• T is for Twitter, which turned blogging small
• Z is for Zuckerberg, the richest of all

Previously:

• A is for Adelson, who cofounded Digg


• B is for Botha, who sold YouTube big


• F is for Fitzpatrick, and "hookers and blow"


• L is for Levchin, who never goes slow


• P is for Parker, the Valley's bad boy


• R is for Rose, who made Digg his toy


• T is for Twitter, which turned blogging small

Previously:

• A is for Adelson, who cofounded Digg
• 
  
• B is for Botha, who sold YouTube big
• 
  
• F is for Fitzpatrick, and "hookers and blow"
• 
  
• L is for Levchin, who never goes slow
• 
  
• P is for Parker, the Valley's bad boy
• 
  
• R is for Rose, who made Digg his toy
• 
  

Previously:

• A is for Adelson, who cofounded Digg
• B is for Botha, who sold YouTube big
• F is for Fitzpatrick, and "hookers and blow"
• L is for Levchin, who never goes slow
• P is for Parker, the Valley's bad boy

Previously:

• A is for Adelson, who cofounded Digg


• B is for Botha, who sold YouTube big


• F is for Fitzpatrick, and "hookers and blow"


• L is for Levchin, who never goes slow

Previously:

• A is for Adelson, who cofounded Digg
• 
  
• B is for Botha, who sold YouTube big
• 
  
• F is for Fitzpatrick, and "hookers and blow"
• 
  

Previously:

• A is for Adelson, who cofounded Digg
• 
  
• B is for Botha, who sold YouTube big
• 
  

Previously:

• A is for Adelson, who cofounded Digg