MedHelp has these nifty little trackers for all sorts of things on their website; I use their sleep tracker. You input the times that you slept that day, what kind of sleep it was (lying awake, interrupted, sleep, snooze, nap), and the quality of sleep (good, normal, bad). It outputs these awesome charts. Please don’t judge my horrible sleep schedule.
P.S. You guys are awesome. :)