This is not strictly true. I've done some of my best bits of work while I've been asleep. Like Mary Shelley, I once stitched together a right monster of an application in my sleep. I even got to the point where I would get half hour's kip on the 17:35 Harlow to Liverpool Street, and wake up at Brimsdown with an RPG source debugger window cobbled together in my head.
But we digress. Nowadays I'd rather not think about work if I can help it. So it's been getting on my wick a bit to find I'm waking up at 3am composing an email, then again at 4 reconfiguring the change control system.
So I've taken to taking a herbal remedy to get some sleep. It's working. And I'm not working. Not tonight anyway.