According to Roger Ekirch, professor of history at Virginia Tech we are all sleep-deprived.

(Mr Ekirch, the author of At Day’s Close: A History of Night-time, says that in the pre-industrial era, most people in Europe practised what he calls “segmented sleep”: having “first sleep” from finishing work until midnight, waking to talk and socialise, then having a “second sleep” until dawn. I know a few teenagers who live like that.)