zeffii
http://blockbuilder.org/zeffii/c2bae16a2b385f0d784a
Charting sleep periods over the course of a number of days.
milestones
https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js
https://d3js.org/d3-time.v0.2.min.js