Evolution of sleep

I mentioned a while back that I'm a total geek and was tracking Timmy's sleep? Well, see below for the results. Each month has the monthly average sleep pattern and awake / asleep times at the top, followed by the data for the individual days. I think it is totally cool how you can see the change from essentially no schedule to a fairly consistent two naps over the eight months.

(Key: Black = asleep, white = awake, yellow = nursing, blue = bottle, red = dream feed; it's hard to see the latter colors in this thumbnail but if you click through to the bigger version you can see them. I started tracking nursing to see if dream feeds made any difference to length of time slept - answer was probably not.)