Okay, if I had ten hours to sleep each night, I'd be willing to do 4 asleep, 1-2 up, and then another 4 asleep.
My problem, is that I too often just end up with a single 4-hour sleep. 😛 #ddtb
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The myth of the eight-hour sleep
Sleeping in one eight-hour chunk is a very recent phenomenon, and lying awake at night could be good for you, according to scientists and historians.

This reminds me of when I was in second grade and we learned in science how the tongue had different regions for salty, sweet, bitter, etc. then in the sixth grade we learned that wasn't true and that everyone's tongue is a little different. Everyone needs different amounts of sleep. My wife needs eight hours or she gets pretty bitchy. I'm fine on six.