That's interesting. Kind of off topic but there is literature to suggest that biphasic sleeping was more normal before: http://www.historycooperative.org/journa

That's interesting. Kind of off topic but there is literature to suggest that biphasic sleeping was more normal before: http://www.historycooperative.org/journals/ahr/106.2/ah000343.html http://www.historycooperative.org/journals/ahr/106.2/ah00034...