According to a Washington Post article, the Spanish sleep an hour less per night than the World Health Organization recommends, while another source claims the Spanish go to sleep later than any country in the world, after Japan. One reason is that Spain is in the wrong timezone. Spain shares the Iberian peninsula with Portugal, and, geographically speaking, is almost perfectly aligned with Britain, both of which operate on GMT, while Spain is on Central European Time, which extends as far east as Poland's border with Belarus and Ukraine. Most of Europe went to Central European Time during World War II, to avoid confusion about when exactly attacks were going to take place. After the war, most countries reverted to their old timezone, but Spain did not. No one knows why.