I only sleep about 4 hours a night on average (though I wish I slept more), but if you looked at my posts and comments they would fall within a 4-5 hour window (most posts happen when I check HN between 7-9am).
Ah, is that over the life-time of my being on HN? I've lived in 3 different timezones, US East, US West, East Australia, as well as spending a few months in Europe.
So, though it looks like I'm spending time on HN all through the day, this is not actually reflective of my behavior without taking that into consideration :)
Hope you didn't spend too much time on that, it's cool to see. Thanks.