To think that if I'd lived in the 17th century my behavior would be 
considered normal...
... well ... some of it at least, had I survived several different 
violent forms of persecution.

It is not unusual for me to wake in the middle of the night, often 
with some insight or other, and work for a few hours before going 
back to bed.

BBC article, from 2/22/2012, on sleep. Good reading for night-owls and others.

The myth of the eight-hour sleep
http://www.bbc.co.uk/news/magazine-16964783

--
Ben Liberman