Danmar
Thinks s/he gets paid by the post
Depends on what you mean by wake up. I frequently wake up at 2-3 AM and read for a while, but almost invariably get back down for a "second sleep" that ends around 6-7. Sure beats waking up for that 4 AM commute.
I often wake up around 1-2am and have trouble going back to sleep. So I get up and surf the net for an hour or so. Often post here during this period. Go back to sleep for another 3-4 hours. Seems to work fine.