is a graph or chart of some sort on a WhiteBoard
detailing the amount of sleep the occupant(s) of the room have had during that day, week, month, semester, or year.
As a frosh, ShamikMaitra averaged 5 hours 26 minutes of sleep per day over the course of several months.
DougHonma and EjWu had a Slackometer. EjWu tended to win (win?) in both the Slack and Classless Days categories. His Slackless Days count was noticeably low as well.
MattBrubeck once kept a Matt's-Brain-O-Meter, which recorded his mental state in four categories (sane/insane, sleep dep/alert, relaxed/stressed, and flavor of/the week) on ten-point scales.