Wow thats really interesting, thanks jswisner.
In that diagram, what does Wach represent? Not Awake, but maybe an ideal time to wake up and go on with said rest?
Because I noticed your at Wach status after about 4 hours, then 7, and then 8.
But waking around 4 would be tricky because of the steepness in that area between deep, IV stage sleep and REM/Wach states. Probably wouldnt be enough sleep anyway.