I agree with house. While on average (and these are my own observations) Americans are awake between 6:00a.m. and 9:00p.m. their respective time zones (typically between 10:00a.m. - 1:00a.m. EDT and 9:00a.m. - 12:00p.m. EST), the users on this site in the rest of the world have different schedules. For example, people in England are usually awake between 2:00a.m. - 5:00p.m. EDT and 1:00a.m. - 4:00p.m. EST.