Arbor Networks just posted about EU and US aggregate internet usage by time of day. They feel that this chart shows that North Americans don't internet over dinner. Maybe....
It also could be that US work commutes take longer than EU ones, so usage drops temporarily. Since NAs would get home later than EUs, NAs would stay online later to get the same amount of Internet as EUs, which would explain the extended usage.
While that sounds nice, it looks wrong, EU supposedly has 38 minutes of commute while the US supposedly has 24.
Oh well, another damned fine theory torpedo'd by facts. ;)