What is sleep, really? What happens when you go? Why don't you die when you sleep? Why does your heart know enough to keep beating? Why do I remember my dreams so well? Why do I dream in the first place? Why do I wake up everyday feeling I have not slept a wink? Why do we fall asleep at night? Why do I fall asleep every chance I get? Why, in all the times I sleep inside public transport, have I missed my destination only once? Why are my naps more efficient than total slumber? Why can't I get myself to last an entire night without sleep? Why do I feel dirty if I haven't slept for the night?
My research into this thing has gone on for as long as I've had access to the net. The best ones made it to my sleep tags over at del.icio.us are this (where I realize I have a large neck; they give a good assessment at the end of the quiz thing) and this. There are also some really good ones at Steve Pavlina's blog -- you better read this guy, he's this total productivity guru -- about how to be an early riser. He's also the guy who's done this whole polyphasic thing which may freak you out -- I've read him while he was trying out the thing and I gotta tell you the guy's driven. He did stop the project but it's fun reading what happened when he was still on it. [Polyphasic sleep is when you take lots of naps during the day so you don't have to go for the long haul -- meaning sleep -- at night.]
The title is from a Norse lullaby which you can read here.