[zatara]

Well, not that I don't think you have a valid point but some very smart people have done otherwise...

"When we were working on our own startup, back in the 90s, I evolved another trick for partitioning the day. I used to program from dinner till about 3 am every day, because at night no one could interrupt me. Then I'd sleep till about 11 am, and come in and work until dinner on what I called "business stuff.""

(http://www.paulgraham.com/makersschedule.html)